1 1/7 TCW Oval-Cut and Round Genuine Midnight Blue Sapphire Platinum over Sterling Silver Ring Top Rated Seller - Trusted Since 1952 - 90 Day Guarantee - Easy Returns - Free PalmBeach Jewelry Gift Box Platinum Over Sterling Silver - Quality Stamp (.925) Sapphire is a precious gemstone available in an array of colors, most popular in a hue of deep blue. Ring Style: Classic Quiet elegance defines this stylish midnight blue sapphire ring treated to 1.10 carats T.W. of oval-cut and round gemstones and sparkling diamond accents. A fashion classic styled in platinum over sterling silver. Sizes 6-10. (All carat weights are approximate and may vary slightly from those listed.)