This is an extraordinary Tourmaline! It's bright green with a beautiful minty blue strip running its length - completely natural and untreated. Quite impressive artwork from nature!
 
I cut this Tourmaline in one of my favorite oval designs called 'Omni-Oval,' written by Robert Strickland.
 
This stone is untreated. The inclusions are not noticeable at a regular viewing distance, as shown in the handshot, and do not detract from the beauty of this natural stone.
 
Tourmaline is a wonderful stone, and one of the most colorful, coming in a vast array of colors, and often sharing more than one color in a stone. Some are even dicrotic, meaning they are different colors depending which side you look through. Tourmaline is a 7-7.5 on the Mohs Hardness Scale, making it acceptable as a ring for everyday wear, but caution should be taken to preserve its beauty. It has the privilege of being marked as October's birthstone.