138 - Beautiful 5.50 Carat Natural Oval Cut Blue Sapphire and 2.70 Carat Round Brilliant Cut Diamond Lady's Ring Mounted in Platinum and 18 Karat White Gold. Diamonds F-G Color, VS1-VS2 Clarity. Sapphire with Vivid Blue Saturation of Color, VS Clarity. Size 6-1/4. Signed PT 900 and 18 K and WB Company Makers Mark. Excellent Condition, Shows Little or No Use. Weighs 4.20 Pennyweights. Shipping $26.00 (estimate $4,000-$5,000)