Tiffany & Co The Guide To Diamonds

The Guide to Diamonds

Standards of Tiffany Brilliance


Tiffany diamonds are brighter and more vibrant because we craft them that way. The combination of Tiffany’s exacting standards for cut and unparalleled craftsmanship produces the most beautiful diamonds in the world. And only the most expertly cut diamonds earn the right to be placed in the legendary Tiffany Blue Box®.


The most important of the 4Cs, cut determines the shape and beauty of a diamond. What sets Tiffany apart is our commitment to crafting the most beautiful diamonds, maximizing scintillation and fire. We craft the most expertly proportioned diamonds, ensuring the meticulous positioning, shape and angle of each facet.


Too Deep: Light escapes through the side.


Perfect Proportion: Light reflects brightly.


Too Shallow: Light escapes at the bottom.


Expert Symmetry: Facets precisely matching in size, shape and alignment create brilliance.


Misaligned Facets: Asymmetry interrupts the movement of light from one facet to the next. 

Tiffany & Co Diamond Cut
Tiffany & Co Diamond Clarity


Diamond clarity is a measure of the purity and rarity of the stone, graded by the visibility of these characteristics under 10-power magnification. A stone is graded as flawless if, under 10-power magnification, no inclusions (internal flaws) and no blemishes (external imperfections) are visible. Absolutely flawless diamonds are exceedingly rare and priced accordingly.


Tiffany’s strict diamond grading standards are executed with expertise, integrity and accuracy.


When Tiffany believes that a diamond’s clarity is on the borderline between two grades, Tiffany will always assign the stone a lower grade—never falsely inflating a diamond’s clarity grade.


The gemological standards in this section refer only to individually registered engagement diamonds set in certain ring styles.


Color refers to the natural tint inherent in white diamonds. In nature, most white diamonds have a slight tint of yellow or brown color. The closer to being “colorless” a diamond is, the rarer it is. The industry standard for grading color is to evaluate each stone against a master set and assign a letter grade from “D” (colorless) to “Z” (light yellow).


Tiffany only accepts diamonds in the “colorless” and “near colorless” range on a diamond color scale. Borderline diamond color classifications are automatically given the more conservative grade. Additionally, the Tiffany Gemological Laboratory will not accept stones exhibiting strong or excessive fluorescence, which, in natural lighting, can give diamonds a milky appearance.


The gemological standards in this section refer only to individually registered engagement diamonds set in certain ring styles.

Tiffany & Co Diamond Color
Tiffany & Co Carat Weight

Carat Weight

Carat denotes the weight of a diamond. Tiffany diamonds are always cut to maximize brilliance, not carat weight.


Tiffany measures diamonds to 1/1000th of a carat; one carat equals .20 grams. Taken by itself, carat weight does not determine a diamond’s value. For example, two one-carat stones can vary widely in price when clarity, color and cut are taken into consideration. When that is understood, it is clear that large diamonds of peerless quality are rare.

Engagement Ring Styles and Settings

Modern or vintage-inspired setting? Diamond or simple platinum band? Round, princess or cushion cut? Our Tiffany Diamond Experts will help you narrow down your options from diamond shape to ring setting.

Responsibly Sourced

We believe fine craftsmanship starts with responsibly sourcing high-quality raw materials and continues through the creation of the final piece of jewelry. From the moment they’re unearthed, Tiffany diamonds selected for our engagement rings never leave the hands of highly skilled artisans, who work with passion and precision to unleash intense vibrancy and light. Once a rough diamond is deemed worthy of the Tiffany name, it is delivered to our diamond cutting experts and our master craftspeople. Tiffany is proud to employ more than 1,500 expert cutters and polishers in our own state-of-the-art workshops. Our sourcing practices honor the places and people that provide us with such astonishing beauty.  We go above and beyond the Kimberley Process—with our own chain of custody controls and by advocating for stronger global standards—to ensure that human rights and the environment are protected.