Green Turquoise Semi-Precious Stone Dice Turquoise is an opaque gemstone that occurs in beautiful hues of blue and blue-green, has been treasured as a gemstone for thousands of years and is the birthstone of December. All of our semi-precious stones are hand crafted from the actual gemstone, so each dice will be as nature created the stone and be truly unique. Every set of Semi-Precious stone dice come with a beautiful pendant of the same stone wrapped in a sterling silver clasp allowing you to show off your stone even when not at the game table.