Diamonds 101


Since all diamonds are not created equally, jewelers use The Four C’s—cut, carat, color and clarity—to examine their distinctions, determine their value and help you decide which diamond is right for you.

The Four C's



A perfectly cut diamond prevents light from “leaking out” through the sides or bottom. At O.C. Tanner, every diamond is cut to a precise standard to create a sensational balance of brilliance and brightness.



Diamond weight is measured in carats, with approximately 142 carats to an ounce. Carat size is a personal preference and should be the least important factor when choosing a diamond.



Most diamonds are nearly colorless with natural tints of yellow or brown. An O.C. Tanner diamond is always exceptionally cut to mitigate natural tint, while maximizing brilliance.



Clarity refers to tiny marks, called inclusions, which exist in almost all diamonds. The size, location, type and number of such markings are graded using clarity scales from the Gemological Institute of America (GIA).

Diamond Certification

As the world’s most trusted name in diamond grading and identification, the Gemological Institute of America provides unbiased analysis to ensure integrity in the gemstone and jewelry community. Every diamond at O.C. Tanner is GIA-certified in both clarity and color.

Diamond Sourcing

At O.C. Tanner, responsible sourcing of our diamonds is of utmost importance. We go to great lengths so that you can have total peace of mind about the origins of your diamond jewelry.

The Kimberly Process

This global initiative from the diamond industry promotes the trade of conflict-free diamonds. All O.C. Tanner diamonds are certified through the Kimberley Process.


We feel morally bound to go beyond the industry standard, which is why we source as many diamonds as possible through Forevermark®. A diamond brand from the De Beers group, Forevermark® provides an ironclad guarantee of responsible, sustainable, conflict-free sourcing. Less than one percent of the world’s diamonds are Forevermark® eligible.

Forevermark®, The Center of My Universe™, the world’s most carefully selected diamonds™ and Forevermark Setting™ are Trade Marks used under license from the De Beers group of companies.


Visit Us

O.C. Tanner Jewelers has been a fixture in the Salt Lake community for over 85 years. Join us for some quality one-on-one time in downtown Salt Lake or in Park City.

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O.C. Tanner Collection

Our industry expert partner has identified a signature diamond cut, which comes alive in our O.C. Tanner Bridal Collection. See for yourself.

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O.C. Tanner is privileged to partner with the world’s most distinctive designers of jewelry, timepieces and fine gifts. Browse the brands behind our collection here.

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How to Buy a Ring

Unsure where to begin? We can help. Here’s everything you need to know about buying an engagement ring.

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Being 1/1 means staying true to yourself. Honor your love story with a one-of-a-kind, custom ring designed and crafted especially for your beloved.

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