sapphire

Dark blue sapphire, 1.09 cts, 6.8 x 5 mm, oval mixed cut, Sri Lanka. © The Gem Trader. Used with permission.

This Bismarck sapphire is on display right next to the large Logan sapphire. Photo by Cliff. Licensed under CC By 2.0.

The Star of India. Photo by Jill Clardy. Licensed under CC By-SA 2.0.

The Logan Sapphire. Photo by stannate. Licensed under CC By-SA 2.0.

This large sapphire crystal from California is still attached to its metamorphic host rock. © Rob Lavinsky, www.iRocks.com. Used with permission.…

This rough and cut set of Sri Lankan sapphires features bi-color blue and yellow hues. © Rob Lavinsky, www.iRocks.com. Used with permission.…

These intergrown blue sapphire crystals from the Koksha Valley in Afghanistan still sit on their schist matrix. © Rob Lavinsky, www.iRocks.com.…

The dark color in this sapphire helps to hide inclusions. It looks very clean. Photo by Katrina Br*?#*!@nd. Licensed under CC By-SA 2.0.

Notice how some of the crown facets don’t meet properly in this Yogo sapphire. Photo by Tim1965. Licensed under CC By-SA 3.0.