News

Kunzite is the pink to violetish purple variety of spodumene. Seen here is a 14,750 carat kunzite crystal. It was eventually carved into a 3,051 c...

Natural Fancy white and Fancy black diamonds are not routinely submitted to GIA for grading (fewer than 2,000 since 2008). These fancy-color diamo...

This ring features a 3.43 carat diamond graded IF, Fancy Vivid purplish pink by GIA. This pink diamond is unusual in that it also has strong blue f...

Red spinel has been called “the gem that made ruby famous," because before people could tell gems apart using science, people thought ruby and spin...

Tanzanite, one of December's birthstones, is a rare blue-to-violet or purple zoisite found only at the foot of Mount Kilimanjaro in Tanzania. Its c...

South Sea pearls are the largest type of cultured pearls. This strand of golden South Sea pearls belonging to GIA's collection range from 13.1 to 1...

Once upon a time, the job of a lapidary was to cut a gemstone while preserving as much weight as possible. Then in the 1970s Bernd Munsteiner inven...

The Blue Moon, a 29.62 carat (ct) blue diamond crystal, was discovered at the Cullinan mine in South Africa in 2014. It was eventually faceted into...

The GIA laboratory in Antwerp regularly receives pink diamond crystals for examination as part of the Diamond Origin Report. This recent service h...

Discovered in San Diego County in 1902, kunzite is a relative newcomer to the gem scene. It is known for its delicate pink to violetish purple colo...

Kokichi Mikimoto, widely considered the father of cultured pearls, was the first person to produce cultured blister pearls in Japan in 1893. Twelve...

GIA scientists recently examined a D color, 0.53 carat round brilliant diamond with a cloud inclusion that looks like the profile of a faceted roun...