The Diamond Buying Guide
Understanding the 4Cs will help you make an informed decision when selling your diamonds and know the fair value of your stones.
The 4Cs of Diamonds
Carat Weight
Carat is the standard unit of weight for diamonds and gemstones. One carat equals 200 milligrams. Larger diamonds are rarer and exponentially more valuable - a 2-carat diamond is worth more than twice the price of a 1-carat diamond of the same quality.
- Popular sizes: 0.50ct, 0.75ct, 1.00ct, 1.50ct, 2.00ct+
- Price jumps occur at magic number sizes (0.50, 1.00, 2.00, etc.)
- Total carat weight (TCW) refers to the combined weight of all diamonds in a piece
Cut Quality
Cut refers to how well a diamond's facets interact with light. It's widely considered the most important of the 4Cs because it directly impacts brilliance, fire, and scintillation.
- Grades: Excellent, Very Good, Good, Fair, Poor
- Ideal proportions maximize light return through the top
- A well-cut diamond appears larger and more brilliant than its size suggests
Color Grade
Diamond color is graded on a scale from D (colorless) to Z (light yellow or brown). Colorless diamonds are the most valuable in the normal range, though fancy colored diamonds follow their own value scale.
- D-F: Colorless - most valuable in the normal range
- G-J: Near colorless - excellent value with minimal visible tint
- K-Z: Progressively more visible color, lower value
Clarity
Clarity measures the absence of inclusions (internal flaws) and blemishes (external flaws). Most diamonds have natural imperfections formed during crystallization.
- FL/IF: Flawless/Internally Flawless - extremely rare
- VVS1-VVS2: Very, Very Slightly Included - hard to see under 10x magnification
- VS1-VS2: Very Slightly Included - minor inclusions visible under 10x
- SI1-SI2: Slightly Included - noticeable under 10x, may be eye-clean
Diamond Certifications
Diamond grading reports from reputable labs provide an objective assessment of your diamond's quality. The most respected labs include:
- GIA (Gemological Institute of America) - The most widely recognized and trusted
- AGS (American Gem Society) - Known for cut grading precision
- IGI (International Gemological Institute) - Growing in recognition
- EGL (European Gemological Laboratory) - Widely used internationally
Having a GIA or AGS certificate can significantly increase the value of your diamond. If you have a certified diamond, bring the certificate when selling for the best price.
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