Dazzling gemstones lit the red carpet at this year’s 85th Academy Awards on Sunday, February 24^th. Striking gowns enhanced by colored gems topped our list of favorite styles. Bold shades of blue, like those worn by Robin Roberts and Lilly Collins, were flawlessly paired with brilliant blue sapphire jewelry. Here are some interesting facts about sapphires and other blue gems provided by our GIA experts that every colored gemstone lover should know.

Tanzanite, December’s birthstone, is found in the shadows of the majestic Mount Kilimanjaro in Tanzania, the only commercial source for the gemstone.

The color blue has inspired poets, songwriters and mankind for centuries. This season, it’s also inspiring plenty of fashion statements, as seen in Vogue, Elle and Los Angeles Times to name a few. It’s no surprise then that blue gemstones are some of the most coveted in the colored gemstone spectrum.

Tanzanite, the December alternate to turquoise and zircon, was not discovered until 1967, so it is a relative newcomer to the list of birthstones. It is named for the one country on earth where it is currently found: Tanzania, in eastern Africa.  Although discovered by others, Tiffany & Co. deserves the credit for naming the gem and popularizing it beginning with a big publicity campaign in 1968.