A 17x7mm rectangular octagonal Kingman turquoise 18K yellow gold over sterling silver necklace measuring approximately 0.75 inches wide with lobster claw clasp - the Kingman turquoise necklace where the rectangular octagonal cut gives the Arizona stone a geometric, architectural character that cabochon cuts cannot achieve. Kingman turquoise from the Arizona mine carries a characteristic medium blue with matrix patterns specific to that deposit. At 17x7mm in warm 18K gold over sterling, the stone has genuine wrist-level presence as a pendant.