925 Solid Sterling Silver 4.5ct Midnight Blue Genuine Natural Sapphire Size 8 Ring This Listing Is For 1 Natural Genuine Dark Midnight Blue color Sapphire Classic Engagement / Cocktail Ring Size 8. Similar in design to Princess Diana / Kate Middleton sapphire ring. 100% natural stone mined from the earth, not synthetic or lab created. Estimated Sapphire weight is 4.50 carats. Oval shape sapphire measures 11x9mm. Top Width measures 16mm = 0.63". This sapphire is surrounded by AAA grade machine cut sparkling czs. Solid Sterling Silver; Rhodium plated to retard tarnish and always shine. Stamped 925. Perfect for those with a discriminating taste for quality, beauty & value. Looking for a gift a unique woman you love? These beauties are gift boxed and ready for giving.