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• Home
• About Us
• Services
• Policy & Guarantee
• Fine Jewelry
• Diamonds

Four main factors determine the value of diamonds.
They are Size (Carat weight), Cut, Color, and Clarity. Often they are referred to as the "Four C's".

GIA introduced its Diamond Grading System in 1953 to assess the quality of each diamond. GIA (Gemological Institute of America) is a non-profit organization that grades only natural loose diamonds and discloses any detected evidence of treatments on their Grading Report. #1 Diamond Source sells only GIA certified loose diamonds. For a further consultation with GIA Gemologist or Diamond Grading Graduate call us (Toll-Free): 877-968-7342. For further valuable reading on key factors to observe before buying a loose diamond online consider the following report: "Essential Guide to Buying Loose Diamonds Online.

A loose diamond's weight is expressed in carats. Carat weight is the easiest of the four C's to determine. To get the exact weight, however, the diamond must be loose. One carat is divided into 100 "points" so that a diamond of 50 points is described as a half carat in size or 0.50 carat. Within common weight ranges, there is little or no variation in per-carat price.

Carat Sizes

SHAPES RELATIVE SIZES

Round

Emerald

Marquise

Pear

0.50

0.75

1.00

1.25

1.50

2.00

2.50

3.00

4.00

CORPORATE OFFICE*: #1 Diamond Source 36 W. 47th St. New York, NY 10036

OFFICE HOURS: M - F (By Appointment)

* Selling at wholesale to the trade and retail to the public.