Ring bronze with pear shape Blackjack Turquoise. This one of a kind ring is a size 6 3/4 and can be sized up to a 7 1/2. Contact us for details regarding sizing. Blackjack Turquoise is mined in Tonopah, Nevada USA and is rare due to limited supply from the mine. This unique stone is known for beautiful blue and green ribbons of turquoise with black matrix.