Color Grade
A scale from D (colorless) to Z (light yellow) grading how much color tint is present in a white diamond.
Definition
The GIA D-to-Z color scale grades the absence of color in white diamonds. D, E, and F are colorless — the highest quality. G through J are near-colorless and offer the best value, appearing colorless to the naked eye in most settings. K through M show a faint yellow tint visible to the naked eye. Z-range diamonds have a distinct color. Fancy colored diamonds (yellow, pink, blue) are graded on a separate scale.
Why It Matters for Ring Design
Color tint is most visible in larger stones and step cuts. In yellow gold settings, color is masked — clients can often choose K or L color diamonds and save significantly. In white gold or platinum, choose G or H for an eye-clean, colorless appearance. Fluorescence can neutralize yellow tones in I-J color stones under UV-rich lighting.
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