Tresorra Diamond Sapphire Necklace $6,750 MSRP Cushion Shape Triple Halo Necklace 18K Yellow Gold. Center Stone: Natural Blue Sapphire (Normal Heat) Weight: 065-0.70 Tcw Side Stones: Diamonds Weight: 0.50 Tcw. Quality: GH VS-SI Measurements: 20.5mm X 18mm Setting: Signature pave setting. Chain: 18" Long 18K Yellow Gold Style: 126YG-BS