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                                                DIAMOND  SHAPES





                               PEAR       HEART    CUSHION      BAGUETTE 


                                  DIAMOND  CUTTING PROCESS
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 each Lazare Diamond 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.

   COLORLESS:   D, E, F   





                                       DIAMOND CLARITY GRADING

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.


                      WHAT IS THE KIMBERLEY PROCESS?

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.

Contact Jeff Deleuse, Graduate Gemologist, for more information.

415-459-3739 Instagram: @janetdeleuse

Jeff Deleuse

  • B.A. Psychology
  • Advanced French Language, University of Nice, France
  • Stanford Continuing Studies
  • Graduate Gemologist, Certified Appraiser 

Janet Deleuse

  • B.S.  Molecular Biology
  •  Stanford Continuing Studies, Art History and Literature
  • Saul Bell International Jewelry Award Judge, 2015
  • Past Board Marin Advocates for Children, 2014
  • Contributing Writer and Featured Designer in Jane Merrill's book"I Love Those Earrings" 2014
  • Audio Contributor to “Cartier & America” Exhibit at the Legion of Honor, San Francisco, 2010-2011
  • Janet Deleuse Couture Featured in Britex  Newsletter, San Francisco, 2012
  • "Fashion & Impressionism" research paper written in Spring 2011; for exhibit
  • Cartier Achievement Award presented June 2009
  • Women's Jewelry Association Award January 2009
  • Contributing Writer for LUXX International Jewelry Magazine, 2009-2010


  • Graduate Gemologists
  • Members of the American Gem Trade Association
  • American Gem Society
  • Jewelers Of America
  • Women's Jewelry Association
  • Contemporary Jewelers Design Group