types of gemstones list
These terms are based on old traditions from the west. These days, all gemstones are considered precious since they are all rare and there is a limited supply of them. The traditional list of gemstones that are considered precious stones are: Diamond.
December Birthstones -Turquoise&Tanzanite. Turquoise is a very unique gemstone, usually cut in a cabochon form and opaque meaning the gem is not transparent. The gem comes in a variety of shades of blue, blue & black, and also a blue/green with black. The gem can be very costly.