PalmBeach Jewelry Men's 18k Gold over .925 Sterling Silver Genuine Sapphire/Cubic Zirconia Ring Top Rated Seller - Trusted Since 1952 - 90 Day Guarantee - Easy Returns - Free PalmBeach Jewelry Gift Box 18k Yellow Gold 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 - Theme: Nuggets and Bling Channel-set midnight blue sapphire ring, 1.75 carats T.W., makes a handsome choice for the fashion-conscious man. With cubic zirconia accents, .20 carat T.W. 18k gold (40 mils) over sterling silver. Sizes 7-13. (All carat weights are approximate and may vary slightly from those listed.)