This indicolite (bluish tourmaline) had a closed C-axis, which is what makes the ends appear black. A gorgeous bright greenish blue reflects very nicely throughout the rest of the stone.
Blue Green Tourmaline
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Believed to have been discovered in the 1500s by Brazilian conquistadors, it wasn’t until 1800s when scientists discovered that tourmaline was its own sort of mineral. Clarity is an important aspect of tourmaline, as it can actually be as transparent as diamond.
The name Tourmaline comes from the Singhalese word (from northern India) “touramalli” which means “mixed colored stones”. Because tourmaline is found in so many different colors they were often confused with other types of gems.
Tourmaline is a birthstone for October along with opal. Tourmaline is also the gem of the 8th wedding anniversary.