14 Karat Blue Synthetic Chatham Sapphire Trillion-Cut Earrings. Rich blue color gemstones prong-set in a double strip of gold with a twist effect, the sapphires measure 7x7mm. The pair of earrings weigh 3.85 grams. Sapphire’s breathtaking blues have captured our imagination and inspired designs. Ancient lore tells us that the blue sapphire brought spiritual enlightenment, inner peace, wisdom, insight, and the discernment to choose what's right. It is September’s birthstone and celebrates the 45th wedding anniversary.