Digital Materials at the GIA Library

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Tanzanite is relatively new to the colored stone galaxy. Almost overnight, tanzanite was popular with leading jewelry designers and other gem professionals, as well as with customers who had an eye for beautiful and unusual gems.

Learn about the factors that make sunstone so desirable.

In the early 1800s sunstone was a little-known, rare, and costly gemstone. It wasn’t until finds in Norway, Siberia, and other parts of the world that sunstone became somewhat more widely recognized, more available, and less expensive.

Not all feldspars that bear the name “sunstone” are from the same side of the feldspar family—both the orthoclase and the plagioclase species boast a sunstone feldspar variety. The name sunstone refers to the gem’s appearance rather than to its chemical makeup.

Learn about sunstone's durability and how to care for your sunstone jewelry.

Spinel is a good candidate for the title of “History’s Most Underappreciated Gem.” Some ancient mines that supplied gems for royal courts from Rome to China produced spinel, but it was usually confused with better-known stones like ruby and sapphire.

Learn about ametrine's durability and how to care for your ametrine jewelry.

Transparent, bicolored quartz with the colors of both amethyst and citrine in the same gem is called ametrine or amethyst-citrine.

The world’s only commercial source of ametrine is the Anahi mine in southeastern Bolivia. Legend has it that a Spanish conquistador discovered the mine’s location in the 1600s and introduced the gem to Europeans when he presented several specimens to his queen.

Following the discovery of a new locality for rose beryl in Madagascar in 1910, George Kunz proposed the name morganite at a meeting of the New York Academy of Sciences on 5 December 1910 to honor his friend and customer J.P. Morgan.

Like many gems found in pegmatites, morganite can form large crystals.

Learn about morganite's durability and how to care for your morganite jewelry.

Learn about the factors that make moonstone so desirable.

According to Hindu mythology, moonstone is made of solidified moonbeams.

Rose quartz jewelry was known to be crafted by the Assyrians around 800-600 BC. The Assyrians, along with the Romans, might have been the first to use this stone.

Rose quartz is one of the many quartz varieties used as a gem material. It gets its name from its delicate pink color, which ranges from very light (almost white) to medium-dark.

了解粉晶的耐用性以及如何保养您的粉晶首饰。