Elements & Artifacts is holding a guessing contest! The winner will receive a pair of earrings made out of the mystery gemstone.

Which Gemstone Is This?
The gemstone I am thinking of is considered to be a major energy-drawing stone and is often worn to boost longevity. Its projective power and energy rivals that of the herkimer diamond, but this mystery stone is not clear or translucent. It comes in up to four colors and is considered rare.

Leave a comment here with your best guess! On Friday, July 16th at 12PM Pacific Time, I will randomize the correct guesses and will announce the winner. Please make sure I have a way to contact you if you don't get comment notifications to this post.

Good luck!

ETA: Another hint. Its name means "little thorn".