Last week, we talked about internal characteristics, or inclusions, and identified some of the most commonly seen ones. Today, we take a closer look at external characteristics, or blemishes, which are confined to the surface of a diamond. (more…)
Last week, we talked about internal characteristics, or inclusions, and identified some of the most commonly seen ones. Today, we take a closer look at external characteristics, or blemishes, which are confined to the surface of a diamond. (more…)
Because diamonds form under tremendous heat and pressure, nearly every one possesses internal and external features called clarity characteristics. These characteristics help gemologists separate natural diamonds from synthetics and simulants, as well as identify individual gems. (more…)
Many people know that diamonds typically come in a range of colors from D to Z on the GIA color-grading scale. However, most people don’t know how the naked eye sees color in a diamond. (more…)
GIA’s 4Cs Q&A series wraps up with some bonus information on fluorescence, while passing along a few friendly words of advice. (more…)
Understand all the aspects of the Diamond Clarity Scale and check out this diamond clarity grading chart in the second of GIA’s 4Cs Q&A series. (more…)
Do you know how diamond color is evaluated? GIA kicks off its 4Cs Q&A series with color grading. (more…)
As seen during the 2013 Oscars, vintage jewelry and diamonds continue to live in the spotlight, as evidenced by this 19th century oval and cushion cut diamond bracelet worn by Jennifer Aniston. But do you know the storied history behind your favorite vintage diamond cuts? (more…)
When buying a diamond, it is important to understand what diamond carat weight is and how the weight of a diamond is measured.
A diamond’s cut and its shape are often confused, but we’re here to help! A diamond’s shape refers to its outline when viewed face up. A diamond’s cut refers to its facet arrangement. (more…)
No diamonds are entirely without inclusions or blemishes, and these characteristics help gemologists accurately determine natural diamond clarity. (more…)
Use of this site signifies your agreement to its terms of use.
© 2002 – 2025 Gemological Institute of America Inc. GIA is a nonprofit 501(c)(3) organization.
All rights reserved.