Founded in 1903, Lazare Kaplan International Inc. has an illustrious history.  Building on tradition and a commitment to excellence, Lazare Kaplan has been the leader in industry innovation: the first to cut diamonds to ideal proportions, the first to laser inscribe diamonds, and the first to offer its uniquely brilliant diamond as a brand.

 The Company’s founder Lazare Kaplan once said, “I am passionate about cutting each diamond as beautifully as possible.”  Today the Company remains dedicated to cutting the world’s most beautiful diamonds, and continues to maintain the highest standards in the diamond industry, cutting every Lazare Diamond for optimal brilliance, scintillation and fire.  Lazare Kaplan International Inc. (LKI) has become the premier manufacturer and marketer of diamonds in the United States and is the world’s largest manufacturer of ideal cut diamonds.

In 1919, Marcel Tolkowsky, a cousin of Lazare Kaplan, developed a mathematical formula for cutting diamonds to precise angels and proportions to gain the optimum reflection and refraction of light.   Lazare Kaplan adopted this approach and the ideal cut theory was put into practice in 1919.

This method, based on a complex formula that measures with exacting precision a diamond’s many angels and proportions, produces a diamond that maximizes the characteristics that discerning consumers prize above all else: brilliance, sparkle and fire.

Because more of the stone must be cut away to achieve such perfection, the ideal cut is costlier than other manufacturing methods, and the manufacturing process demands a much higher level of skill on the part of the diamond cutters.  So rigorous and demanding is the process that less than 1 percent of the world’s diamonds are ideal cut.

LKI is still today devoted to the art of cutting The Lazare Diamond® and Deleuse Jewelers in Tiburon offer  the world’s most beautiful diamonds® to the same original exacting standards.

 The ideal cut isn’t the only thing that differentiates Lazare Diamonds from other diamonds.  On the outer perimeter of each diamond, the Lazare logo and an identification number unique to that diamond are inscribed with a laser beam.  The logo serves as proof of authenticity, while the number is proof of ownership in case of loss or theft.   In the early 80′s LKI co-invented this process.  The inscription itself is invisible to the naked eye but can be viewed under 10-power magnification and does not affect the clarity grade of the diamond.

 This laser “signature” enables LKI to market its ideal cut diamonds as a unique, brand name product known as The Lazare Diamond.   Knowing that a particular brand name represents quality and is only available through the finest jewelers makes people feel more secure in their purchases.  By asking for Lazare Diamonds by name, consumers are assured of the finest quality and cut.

To purchase or view Lazare Diamonds visit:   Deleuse Jewelers in Tiburon, Ca

Jeff Deleuse, Graduate & Certified Gemologist


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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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