This intarsia style cabochon is made with composite Turquoise and Mother of Pearl with brass and is backed with Black Jade. This product is composite (TrueStone)* which means they use ground up turquoise (color enhanced), then they add binding agents and compress it into a block. This is manufactured by RT Research in Tempe, Arizona. Lapidary by Phil, he took these pieces of composite materials, put brass between them and backed with Black Jade.
Flat polished beveled back