< Back About Tiffany Engagement Rings

beyond the 4Cs

The superlative beauty of Tiffany engagement diamonds can be explained by the strict quality standards that go well beyond the popular but oversimplified 4Cs. Tiffany frequently rejects stones that would be accepted by others.

Many diamond cutters choose to place the size of the stone above its potential beauty. Tiffany refuses to make this compromise.


Cut—the precise shape and positioning of a diamond’s facets—determines the stone’s general appearance and its beauty. Tiffany diamonds are properly proportioned and cut to achieve the ideal balance of brilliance, dispersion and scintillation.

carat weight

“Carat” denotes the weight of a diamond. One carat equals 0.20 grams. Tiffany measures diamonds to 1/1000th of a carat. Taken by itself, carat weight does not determine a diamond’s value.

Two one-carat stones can vary widely in price when clarity, color, cut and presence are taken into consideration.

At Tiffany, 99.96% of the world’s gem-grade diamonds fall short of our standards. So you can rest assured that every Tiffany diamond engagement ring is superlative.

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A stone is said to be flawless if, under 10-power magnification, no internal flaws (clouds, feathers, pinpoints) and no external imperfections (scratches, pits, nicks) are visible. Absolutely flawless diamonds are exceedingly rare and priced accordingly. Gem-grade diamonds are given a clarity rating based on an industry-standard scale.

view diamond clarity scale

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When Tiffany believes that a diamond’s clarity is on the borderline between two grades, Tiffany will always give the stone a lower grade.


Minute impurities within diamonds lend the stones subtle colored tints. At Tiffany, laboratory experts determine the color of each diamond by comparing it to authenticated “master” diamonds. Each stone is then color-graded to a precise scale from “D” (colorless) to “Z” (saturated).

view diamond color scale

Only diamonds of “I” level (near colorless) or better are accepted at Tiffany, all previous evaluations being held in question until the stone has been deemed to be of Tiffany quality.

Unlike the documentation that may accompany diamonds purchased elsewhere, the Tiffany Diamond Certificate is backed by a Full Lifetime Warranty.

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Tiffany uses a unique series of measurements called “Presence” which can determine a diamond’s brilliance and beauty in profound ways. They include precision of cut (a diamond cutter’s high level of skill in creating a scintillating Tiffany diamond), perfectly proportioned cuts and a diamond’s high polish grade, which ensures that a stone’s beauty is not compromised.

The Tiffany Gemological Laboratory

Tiffany maintains a state-of-the-art diamond grading facility with a staff of highly experienced gemologists who grade our diamonds.

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In-store or speak to a Tiffany Diamond Expert at 800 518 5555.