Not to be confused with the shape of a diamond, cut refers to the arrangement of a diamond’s facets. Cut is the most important of the 4C’s and is the only “C” under man’s control.
Using an exacting mathematical formula, our master cutters create ideal cut  diamonds with astounding precision.

All light beams should be refracted up to the viewer's eye as shown in the 'ideal' sketch in the diagram as opposed to 'shallow' and 'deep' cut allowing light beams to travel out of the stone.

The result: unparalleled beauty and grace, maximizing the coveted diamond characteristics of brilliance, scintillation and fire.

                                    DIAMOND COLOR GRADING  

Color is determined by viewing the body of the diamond from the side with the table down and proper lighting.
Pure colorless diamonds are classifies as "D" and the color scale ranges alphabetically from D-Z.
Diamonds range from colorless - the rarest and most valuable - to various degrees of yellow.







Clarity is the degree to which identifying characteristics known as inclusions are present in a diamond.

FLAWLESS; Internal Flawless No inclusions visible under 10x magnification
VVS, VVS1, VVS2: Very Very Slight Inclusion Inclusions are minute, extremely difficult to locate under 10x magnification
VS, VS1, VS2: Very Slight Inclusion Inclusions are minor, difficult to locate under 10x magnification
SI, SI1, SI2: Slight Inclusion Inclusions are noticeable, relatively easy to locate under 10x magnification
I, I1, I2, I3: Imperfect Inclusions are visible to the unaided eye
Carat weight is a standard unit of weight used for gemstones. A diamond s weight is the easiest of the 4C's to measure.

One carat is equal to 200 milligrams. Carat weight can be expressed as a decimal, fraction, or in "points." There are 100 points in a carat. A 50-point diamond is 1/2 a Carat.


As a concerned leader of the international diamond industry, Lazare Kaplan and Deleuse Jewelers fully supports policies that prohibit the trade in conflict diamonds, prevent money laundering, and combat the financing of terrorism. The Company complies with clean diamond trading and anti-money laundering legislation adopted by the United States Government, such as the Clean Diamond Trade Act, and supports relevant resolutions by concerned governments and the United Nations. 

Lazare Kaplan will continue to join diamond industry and trade associations in condemning and combating the trade in illicit diamonds and to comply fully with World Diamond Congress (WDC) resolutions for industry self-regulation in respect of the Kimberley Process Certification Scheme, including the implementation of the WDC's prescribed System of Warranties.

Deleuse Jewelers stocks Lazare Kaplan diamonds and jewelry with full insurance that the diamonds we sell are conflict free.

Jeff Deleuse, Graduate Gemologist and Certified Appraiser
Insurance and estate appraisals.

415-459-3739     deleuse@deleusejewelers.com.       deleusejewelers@gmail.com


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“Janet, thank-you for everything you do. As I said before, you are truly an artist, and that is why it is so special buying jewelry from you.” Peter, Atlanta, GA

” Beauty, exquisite design, pleasant and personalized attention. These qualities have been constant in our 20 years of shopping with Janet and Jeff Deleuse – Two exceptionally talented and caring people. The Best!’ Helen P.,Belvedere

"This store has a very pleasant environment and Jeff and Janet are both kind, wonderful people. I used Jeff a few times for appraisals and he was very thorough and was happy to answer lots of questions. He uses scientific methods and tests rather than going solely by appearance as some jewelers will try to do, and his expertise is well respected. On one occasion, he even went out of his way to help expedite a deal for me. He has my highest recommendation. Suzanne T., San Rafael, CA

“Jeff is an incredible gemologist who knows everything there is to know about gem stones. He is a true professional and can be trusted. The quality of their work is impeccible and always consistent. I would recommend Deleuse Jewelers to anyone looking for a new, “bauble,” for themselves or someone special!” Terri B., Ross

"I have used Deleuse Jewelers for many years - for everything from purchasing jewelry to repairing jewelry to getting appraisals on jewelry. Their service and work is superb. I highly recommend them." Suzanne S., Tiburon, CA

"I purchased this beautiful chain from Janet Deleuse about 3 weeks ago. It was an online purchase so I was hoping I would be pleased. It exceeded my expectations as it was exactly as pictured. Delicate and perfectly crafted. Packing was very secure and shipping was quick. I would not hesitate to purchase from Deleuse again! Michele, New Jersey

“Janet and Jeff designed and crafted our wedding rings and did a great job. They worked with existing diamonds we had in an antique ruby cocktail ring, added the sapphire stone and made a beautiful pendant with the ruby. In addition, they designed earrings for our daughters. All are still in great shape today. They are easy to work with and very reliable and trustworthy.” Peg M., San Anselmo

Accreditation includes diplomas from the Gemological Institute of America and the American Gem Society and thirty years of experience.

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