Back to gem encyclopedia

Diamond

Diamonds are among nature’s most precious and beautiful creations.

See gem as
Polished
Rough

Tools

Research

A wide choker-style necklace of a row of emeralds with rows of diamonds above and below the emeralds.

Article

Spring 2019 Auctions: Premium Prices for Historic Pieces

Russell Shor, June 14, 2019

Gemstones and jewels with historical provenance are bringing the best prices at the spring 2019 auctions.

People meet and mingle at the entrance to the JCK Show.

Article

Headwinds Slow 2019 Vegas Business, Lab-grown Diamonds Proliferate

Russell Shor, June 14, 2019

Decent demand for finished jewelry, but less for loose gems. Plus: Lab-grown diamonds and responsible, sustainable business practices.

Article

Is There a Difference Between Natural and Laboratory-Grown Diamonds?

Russell Shor, May 31, 2019

Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference

The entrance to the GemGenève show featured a large graphic wall.

Article

Trade Hopes for a Bright 2019 Vegas Show

Russell Shor, May 21, 2019

All eyes are on the upcoming jewelry sales events in the U.S. – the Luxury and JCK shows in Las Vegas – as business slows in other parts of the world.

Orange-red-purple garnet and green clinopyroxene minerals can be analyzed for specific isotopes to help determine diamond ages.

Diamonds from the Deep: How Old Are Diamonds? Are They Forever?

Karen V. Smit and Steven B. Shirey, May 15, 2019

Age dating diamonds, which have been forming for billions of years, using isotope analyses reveals new information about the deep earth.

552.7 ct Yellow Diamond from the Diavik Mine

The Largest Diamond Ever Discovered in North America

Wuyi Wang and Evan Smith, May 15, 2019

GIA examines a 552.7 ct diamond from the Diavik mine in Canada.

Natural diamond with CVD synthetic diamond overgrowth

CVD Layer Grown on Natural Diamond

Troy Ardon and Garrett McElhenny, May 15, 2019

A composite of synthetically grown and natural diamond was recently identified by the Carlsbad laboratory.

Article

Diamond Research Gives Clues to the Formation of the Continents

Karen V. Smit, April 25, 2019

Mineral inclusions trapped in diamonds reveal the continents’ construction – and helps GIA researchers date diamonds.

A model holds a large cut-corner square diamond with three fingers.

Article

De Beers Ups Supply, FTC Warns About ‘Eco’ Claims

Russell Shor, April 22, 2019

DeBeers responds to fluctuations, and the FTC issues warnings on laboratory-grown diamonds. Plus: 302.37 ct Graff Lesedi La Rona is revealed.

A woman sits in front of a computer screen with the DiamondView to her right.

Article

Inside De Beers’ Lightbox Diamonds

Russell Shor, March 18, 2019

GIA researcher analyzes and confirms that De Beers’ Lightbox diamonds are grown using the chemical vapor deposition process.

This Month's

Featured Gems

Peridot

Found in lava, meteorites, and deep in the earth’s mantle, yellow-green peridot is the extreme gem.

Fancy Color Diamond

Dazzling brilliance. Captivating color. These are the planet’s most valued gems.

Diamond

Diamonds are among nature’s most precious and beautiful creations.

Emerald

Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine.

Citrine

Citrine is the transparent, pale yellow to brownish orange variety of quartz.

View the Gem Encyclopedia

Diamond

Research

Reviewed

Topics

Topics

Gemstones

Gemstones

Featured Gems

Peridot

Fancy Color Diamond

Diamond

Emerald

Citrine

Diamond

Research

Reviewed

Topics

Topics

Gemstones

Gemstones

Featured Gems

Peridot

Fancy Color Diamond

Diamond

Emerald

Citrine

You Might Also Like

Find a Retailer

Shop the Campus Store

Quality Assurance Benchmarks

G&G Spring 2019 Edition