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Diamond certified companies are top rated and guaranteed

Why Trust Diamond Certified Marble and Granite Companies Rated Highest in Quality?

Granite countertops and marble flooring in a remodeled kitchen.

You are the customer. If your goal is to choose a marble and granite company that will deliver high customer satisfaction and quality, you’ll feel confident in choosing a Diamond Certified granite and marble company. Each has been rated Highest in Quality in the most accurate ratings process anywhere. And you’re always backed by the Diamond Certified Performance Guarantee. Here’s why the Diamond Certified ratings and certification process will help you find a top-rated marble and granite contractor and is unparalleled in its accuracy, rigor and usefulness:

1) Accuracy: All research is performed by live telephone interviews that verify only real customers are surveyed, so you’ll never be fooled by fake reviews.

2) Statistical Reliability: A large random sample of past customers is surveyed on an ongoing basis so the research results you see truly reflect a Diamond Certified company’s top-rated status.

3) Full Disclosure: By clicking the name of a company above you’ll see the exact rating results in charts and read verbatim survey responses as well as researched articles on each qualified company.

4) Guaranteed: Your purchase is backed up with mediation and the Diamond Certified Performance Guarantee, so you can choose with confidence.

Click on the name of a Diamond Certified company above to read ratings results, researched articles and verbatim customer survey responses to help you make an informed decision.

More than 200,000 customers of local companies have been interviewed in live telephone calls, and only companies that score Highest in Quality in customer satisfaction–a 90+ on a 100 scale–as well as pass all of the credential-based ratings earn Diamond Certified. By requiring such a high score to qualify, the Diamond Certified program eliminates mediocre and poorly performing companies. Read detailed information about the ratings and certification process.

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  • Caesarstone

  • Silestone

  • Neolith

  • Dekton

Swenson Granite
DuPont Granite
Soterra Natural Stone

granite countertops
marble countertops
marble tile
granite tile
granite sinks
marble installation
natural granite
natural marble
custom granite counters
granite vanity top
tumbled marble
granite flooring
marble mosaic
marble fireplace
granite installation
marble slabs
cultured marble
marble flooring
granite slabs
granite fireplace
honed granite
travertine marble
granite fabrication
granite slate
granite pavers

Bel Marin Keys
Belvedere Tiburon
Black Point
Corte Madera
Dillon Beach
Forest Knolls
Kent Woodlands
Lucas Valley
Marin City
Mill Valley
Mission Rafael
Muir Beach
Muir Woods
Point Reyes Station
San Anselmo
San Geronimo
San Marin
San Quentin
San Rafael
Santa Venetia
Sleepy Hollow
Stinson Beach
Strawberry Point
Tamalpais Valley
Terra Linda


Know What You Want
As You Consider Getting Marble and Granite in Marin County

As you decide whether you want to install marble or granite in your home or office in Marin County, whether in San Anselmo, San Rafael, Larkspur, Novato, or Mill Valley, you want to know what you’ll be looking for from your marble and granite merchant. You need to prepare yourself so that you get the best service. It’s a good idea to ask yourself some questions so you have a good idea of what you want. The better you know what you want, the better you will be able to use your marble and granite merchant’s expertise to help you.

  1. Do I want a Diamond Certified company that is rated best in quality and backed by the Diamond Certified Guarantee?
  2. Is the room where I want to install stone sufficiently completed – are the plumbing and electrical at least roughed in?
  3. Do I have a preference for materials – marble, granite, slate?
  4. Do I want a stone backsplash in the kitchen?
  5. Is the material I am considering right for the application – for example, do I really want to use marble for a kitchen countertop?
  6. Where do I want to place stone material – in the kitchen, on the floor, in the bathroom, for countertops?
  7. If I am working in the kitchen, are the cabinets and hardware installed so that measuring for the kitchen countertop will be correct?
  8. If I am attracted to stone with naturally occurring features like fissures, am I willing to install a substrate to support the stone?
  9. Do I have any concerns or preferences about the epoxies or polyester resins that might be used to install my stonework?
  10. Do I want to use stone panels or am I looking for stone tiles?
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What To Ask In Person
Some Questions to Ask Your Marin County Marble and Granite Installer in Person

In working on your home or office in Marin County, whether you are in San Rafael, San Anselmo, Fairfax, Belvedere, Larkspur, Novato, Mill Valley, Corte Madera, or Tiburon, you will probably spend a fair amount of time with your marble and granite installer. The most important time will be during the preparation of the shop drawing and any templates derived from the shop drawing. The shop drawing represents the final design of how the stone will appear in your home or office, so spend the time to get it right. Ask all the questions you need to ask, and persist until the shop drawing looks the way you want your installation to look. You might want to prepare a list of questions to remind you what to ask. Some of those questions might include the following:

  1. Can you show me how you will match the marble veining across different cuts of the stone?
  2. Can you cut the marble so that the fissure falls where the strongest support is?
  3. Can you show me where the seams in the countertop will be placed?
  4. I have a heavy iron sink – do I need extra support or framing for it?
  5. Can you cut the corner so that there is no seam across it?
  6. I am installing stone tile; can you please lay it out first so that I can approve the color shading and how the veining runs?
  7. I want to extend the countertop so that it is cantilevered. Will I need corbels to support it?
  8. Can you show me how the veining in the marble will run once it is cut?
  9. I may want to change the sink from top-mounted to under-mounted. Will that make a difference?
  10. Can you show me the options for cutting the edges of my stone countertop?
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  • What To Ask References
    Questions for references

    It’s best to choose a Diamond Certified marble and granite fabricator because all certified companies have passed an in-depth ratings process that most other companies can’t pass. If you want quality from a marble and granite company in Marin County and the greater Bay Area, you can have confidence choosing a Diamond Certified company. Diamond Certified reports are available online for all certified companies. And you’ll never be fooled by fake reviews. That’s because all research is performed in live telephone interviews of actual customers.

    If you can’t find a Diamond Certified marble and granite firm within reach, you’ll have to do some research on your own. If you do, it’s wise to call some references provided by your marble and granite company. Keep in mind, though, that references provided to you by the marble and granite company are not equal in value to the large random sample of customers surveyed during the Diamond Certified ratings process. That’s because references given to customers from companies are cherry-picked instead of randomly selected from all their customers. So the contractors will likely give you a few customers to call that they know are satisfied.

    If you do call references on your own, specifically ask for a list of the company’s 10 most recent customers. This will help avoid them giving you the names of only customers they know were satisfied.

    1. If you bought your stone from a supplier other than the fabricator, did the fabricator help with getting trade pricing? With arranging to move the stone from the supplier to the fabricator?
    2. Did you choose your stone at the fabricator’s or separately?
    3. Did you use stone tile or stone panels?
    4. What room or rooms did you use marble and granite on?
    5. Did your marble and granite installer leave the work site clean and tidy?
    6. Did you use resin-impregnated stone and did you have any issues?
    7. What stone did you install and what kinds of sealants or impregnators did you have applied, if any?
    8. How long have you had your stone and have you noticed anything you would do differently?
    9. Were you satisfied with the work your marble and granite installer did? Why or why not?
    10. Did the marble and granite fabricator come promptly and work consistently throughout the day?
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  • Review Your Options
    Find and Hire a Good Marble and Granite Company in Marin County

    The Diamond Certified symbol has been awarded to companies that scored Highest in Quality in an accurate ratings process.

    Your choice of marble and granite company… So before deciding on the best marble and granite installer in Marin County for you, it’s important to consider the following questions.

    1. Where do you plan to install the stone – and will your marble and granite fabricator recommend the appropriate stone for the application?
    2. Who will source the stone, you, your fabricator, or you with your fabricator’s help?
    3. Does the marble and granite fabricator welcome you into the shop drawing process, getting your input during the design process?
    4. Does the marble and granite installer offer trained technicians to measure your space so that the dimensions are correct?
    5. Does the marble and granite fabricator offer beautiful designs and show good sense in the placement of seams, cutouts for sinks or other appliances, as well as other design details?
    6. Does the marble and granite installer offer good customer service and do the installers demonstrate that they are trained in stone and stone tile installation?
    7. Does your fabricator share your concern about using the proper sealants or impregnators, taking into account both the stone’s intended use and the chemical nature of the sealant or impregnator?
    8. Does the marble and granite installer demonstrate knowledge of industry standards, such as recommended tolerances for stone thickness, installed stone levelness, and seam (aka joint) width?
    9. Does the marble and granite installer provide written estimates and written agreements when work must deviate from standards because of the stone’s nature?
    10. What kind of stone will you use – do you want a hard granite for a kitchen countertop? Or are you willing to risk staining from acids and scratches, and use a marble countertop in the kitchen?
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  • How To Work With
    Deciding to Hire a Marin County Marble and Stone Installer

    Before you decide to hire a marble and stone installer to work in your home or office in Marin County, whether you live in Sausalito, San Rafael, San Anselmo, Novato, Mill Valley, Tiburon, Corte Madera, or Larkspur, do a little preparation. Look for established companies that focus on offering trained service personnel. Your company must have a license from the state of California. They may have a mason’s license, or a tiler’s license. Always check their advertising for the license from the state of California, then go to the Contractors State License Board Web site and check that the license is valid. Ask several firms for written, detailed estimates before working with any.

    Ask explicitly what services the marble and granite fabricator offers. Will they source the stone or help you work with the stone supplier? Many will help you get trade discounts from suppliers and work with the supplier to move the stone from the yard to the fabricator’s shop. But it’s up to you to find out what those relationships are and how you might or might not benefit from them.

    A basic understanding of stones and their characteristics can help you. A good fabricator can help you choose the appropriate material, but you might be more open to their suggestions if you understand more about the stones. You should also have a good idea of the room or rooms where you want to put the stone and how much other construction is being done in those rooms so that the rooms are in the appropriate state by the time the marble or granite is installed.

    Having Found Your Marble and Granite Installer in Marin County
    Once you’ve decided on the right marble and granite installer for you in Marin County, whether in Larkspur, Novato, San Rafael, San Anselmo, Mill Valley, or Tiburon, take advantage of their expertise and work with them. Often the marble and granite installer can help with recommendations about what material to use. Collaborate with the marble and granite installer on the design of how the stone will be installed. Pay particular attention to how the marble or granite is cut, so that veins or other distinctive markings and features are highlighted or disguised, as you wish. Also pay attention to where cutouts are needed for sinks and appliances. Be prepared to discuss seam, or joint, placement, and pay especial attention to the seams where different materials adjoin each other. If they are a concern for you, discuss the sealants or impregnators used to protect the stone. You may also want to learn a little about the adhesives used to adhere the stone. It’s a good idea to ask about whether additional support or substrates are needed to support the stone.

    Making the Job Easy for your Marin County Marble or Granite Installer
    You can take a few steps to help the job go more easily for your Marin County marble and granite installer. Whether your home is in San Anselmo, San Rafael, Novato, Mill Valley, Larkspur, or Fairfax, make sure there is no one else there to conflict with the marble and granite installer on the day of installation. Make sure that plumbing and electrical are at least roughed in. Don’t ask a marble and granite installer to do plumbing or electrical work. Make sure there are clear pathways, especially since stone is heavy. Be present so that you can approve the layout of the stone or stone tiles before it is adhered into place. If you can’t be there, get a designated approver to be there in your stead – you really want someone to approve the final layout before it is set. Be sure you’ve asked all the questions about sealants and impregnators before the job begins and have read the labels prior to application.

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  • Be a Good Customer
    How Can You Be a Good Marble and Granite Company Customer?

    It’s the marble and granite company’s responsibility to put in quality marble and granite using the best possible installation techniques. But you play a big part in the success of your marble and granite company, too. Here are a few simple steps you can take to be a good customer when hiring a Marin County marble and granite company.

    • Be clear and upfront with the marble and granite company. Let them know what you want from your marble and granite, the long-term outcome you’re expecting and specific ways they can satisfy your expectations.
    • Remember, a friendly smile goes a long way!
    • Before you hire a marble and granite company in Marin County, restate your expectations and goals, and reiterate to the marble and granite representative your understanding of the agreement. Most problems with local marble and granite companies occur because of a breakdown in communication. By being clear about your expectations and theirs, you can avoid most conflicts.
    • Ask your marble and granite company if you should call to check on the progress or if he will call you with updates.
    • Be sure your service representative has a phone number where they can reach you at all times while they’re installing marble and granite. The work will move along more smoothly if your marble and granite company can reach you for any necessary updates, questions or work authorizations.
    • When your contractor contacts you, return calls promptly to keep the marble and granite company on schedule.
    • Pay for the marble and granite company’s work promptly.

    Why would you want to be a good customer? Marble and granite companies in Marin County appreciate customers who are straightforward, honest and easy to work with. Your good customer behavior sets the tone from your end and creates an environment conducive to a good relationship. Things may very well go smoother and any problems may be more easily resolved.

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Check The Work
Verify the Work Against the Estimate and Invoice

The marble and granite installer should provide you with a written estimate. And you will also get an invoice after the job completes. Be sure that both are detailed and include separate line items for materials and labor. A single lump sum will not help you, since it is not clear what it covers. Check that the material installed is the designated material. Check that any substrates, or additional supports, that were needed are installed. Check that any sealants or impregnators that were to be applied are actually applied. Check for level surfaces, level stones, and small seams, or joints.

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Written Warranties
Be Sure to Ask Your Marin County Marble and Granite Installer for Warranties

Before signing on for a job, ask your marble and granite installer about all warranties they offer. It’s possible for stone to get chipped or cracked, or otherwise damaged in transit or installation. Ask about repair and replacement policies if your stone gets damaged. Also ask about warranties for service. Stone and stone tiles endure for a long time. It takes skills and training to install them properly. Ask whether and for how long the installation is guaranteed. For example, on a countertop, you may want a little give to allow for normal stresses, but too much give will cause the stone to crack. Ask the marble and granite installer if they guarantee against this and similar defects in the work.

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Top 10 Requests
Top Service Requests

The inherent beauty of marble and granite make them attractive to many. Your Marin County marble and granite installer should help you create a beautiful design, cut the stone to display its best attributes, and install the stone so that it wears for a long time. Below are some of the most common requests made to marble and granite fabricators.

New Bathroom Countertops
Many like the appearance of natural stone in the bathroom, and bathroom countertops can also be chosen to highlight dramatic bowls and fixtures.

New Floors
Marble, travertine, and other stones or stone tiles are popular for floors. A polished stone will create a shiny floor, or a honed stone will have a smooth but more matte appearance.

Office Kitchens
Office kitchens are not as drab as they once were. The hard-wearing nature of natural stone makes it a good choice for areas with lots of traffic.

Stone Cutting
Cutting stone well takes real training and a feel for the stone. The best cutters can reveal the natural beauty of the stone. They may also be able to cut so that the parts of the stone that you don’t like are not as obvious. A good stone cutter can cut so that veins can be placed to run in the same direction.

Your marble and granite installer can help you design your stone installation. They should especially help you understand the importance of seam, or joint, placement and help you cut your stone to take best advantage of the stone when it comes to seam placement. The marble and granite installer should also be familiar with different materials and sensitive to color shading and vein placement.

Technical Knowledge
Many of us just want a beautiful countertop, or kitchen, or bathroom. We rely on the marble and granite installer to have technical knowledge and be aware of industry standards. For example, the marble and granite installer should be able to advise on how long the distance between supports should be, based on the stone thickness and type. The marble and granite installer should also know how wide seams should be, how to join different pieces of stone, and whether a subtop, or other substrate support is needed.

New Backsplash
As far as marble and granite installers are concerned, a backsplash is separate from the countertop. If you do want a countertop, mention it to your marble and stone installer. You will need to choose material for your backsplash and design it as well.

Edge Cutting
The edge of a counter can contribute greatly to its appeal. The edge is one of the most significant parts of the cost of a countertop. The marble and granite installer will offer you a choice of cuts for the edge. The thinner an edge, the more vulnerable to chips.

Stone Repair
Stone can chip from being handled, or it may have fissures, which occur naturally. In some cases, chips, fissures, and cracks can be mended using a resin to fill the space. Smaller chips may be sanded down, though this will make seams appear wider. Your marble and granite installer may be able to make small repairs if your stone gets damaged over its lifetime.

New Kitchen Countertops
Granite is the most popular choice for kitchen countertops. It is very hard, which makes it resistant to scratches. Marble is sometimes used, but as a much softer stone, it scratches fairly easily and is also vulnerable to acids like lemons or tomatoes, and also to some household chemicals or abrasive cleaners.

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Glossary Of Terms
Glossary of Terms Used By Local Marble and Granite Contractors

You may find it helpful to know a few industry terms when you speak with your marble and granite fabricator or installer. Use the glossary to help inform your conversations and better understand what your granite & marble contractor tells you.

A stone carving term, it means to remove material so that the remaining parts are left standing out in relief.

abrasive finish
Refers to a surface that has been finished or polished so that it is not reflective. The size of the grit used to make the surface can make a difference.

abrasive hardness
A rating that measures how well stone will wear when subjected to foot traffic.

When referring to how much water a stone will absorb, the result is described as a percentage by weight.

When used in masonry, refers to material that is added to concrete or mortar to make the curing go faster.

acid wash
An acid wash is a method for distressing a stone surface by applying a substance. Acid washes work best on calcareous stones.

Refers to a stone veneer that has been securely fastened using a bonding material on an approved backing.

Admixtures are substances that are introduced into mortar or cement as the water, aggregates, lime or cement, are being mixed to form the mortar or cement. Admixtures may act as colorings, water repellants, or accelerators.

Rocks or particles of rocks, they can be naturally occurring, such as sand or gravel, or manmade, such as crushed concrete. Aggregate may be used as it comes without cohering material, or it may be mixed into mortar or concrete.

An alkaline product is more basic than acidic. Alkaline is in some sense the opposite of acid. Carbonate of sodium is alkaline.

allowable capacity
Refers to how much load a stone anchor can safely bear.

A metal fastener that connects dimension stone to adjacent stone units or to a structure. The corrosion resistant fastener may be flat or round.

Also known as: straps, dovetails, rod cramp, rod anchor, eyebolt, dowel

When you have a projecting stone top, an apron may be added as a decorative or trim piece that comes down below the overhang. For example, if you have a countertop that overhangs a cabinet, an apron may be added to the very top of the cabinet, where the cabinet meets the countertop.

A noticeable area where two surfaces meet that have been ground down.

artificial stone
A manufactured product that tries to reproduce the look of natural stone.

Also known as: engineered stone, cultured marble

Refers to the placement of square or rectangular stones on a facade. Random ashlar has differing heights and lengths so that the placement appears random. Coursed ashlar looks like horizontal lines, while stacked ashlar looks like vertical lines.

axed work
Refers to a stone surface that has been hand-dressed so that it displays tool marks made by an axe, bush hammer, or pick.

back anchor
An anchor that comes out of the back surface of a panel of stone. In contrast, other types of anchors push into the edges of a stone panel.

Refers to applying adhesive material to the back of the stone or other material to be applied. Some adhesive is put on the back of the product to be installed, while the rest in the bed where the product is to be installed. Back-parging is designed to make sure the entire unit is adhered to the base.

Also known as: back-buttering

One of a series of short, vertical pieces that support a railing or coping. Together, all the pieces, both supports and railing, form a balustrade.

Also known as: balustrade

belt course
A horizontal, continuous series of stones placed in a wall that creates a division.

When corrosive metals or materials such as putties, mastics, or sealing compounds make a stain on a surface.

Refers to a design technique for laying material in which the material is placed randomly, so that is does not display a uniform color. The area of non-uniform color is then contrasted with regions that do have a uniform, but very different, color.

book match pattern
Refers to a technique for matching veins in natural materials. In the book match pattern, the opposite faces of adjoining slabs are used, so that a mirror image of the veining is seen. Polishing enhances the visibility of the veining.

A stone that sticks out and that will be carved in place. Or, for a Gothic vault, the craving that disguises the rib junction.

bugged finish
For limestone, a smooth finish achieved by grinding it with power sanders.

A technique that creates a flat treatment from grinding or cutting that will get rid of the sharp edge where two surfaces converge.

For the exterior of a wall or other structure. A stone veneer that is not load-bearing.

Refers the areas where natural stones are likely to naturally break.

Also known as: cleft

A honed surface is very smooth but has very little or no shine.

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