ArmentaMidnight Boulder Opal Diamond EarringsDetailsArmenta earrings from the Old World Collection. Signature Midnight oxidized sterling silver. Oval drops with boulder opal mosaic, trimmed in 18-karat yellow gold. Marquise-cut blue sapphire. Round, white diamonds. 0. 25 total opal carat weight. 0. 34 total blue sapphire carat weight. 0. 02 total diamond carat weight. Post backs with granulated drop fronts. For pierced ears. 1" drop. Made in USA. Designer About Armenta: When Texan Emily Armenta first created a feminine, Spanish-inspired line of oxidized sterling silver pieces set with diamonds and gemstones, her goal was to create romantic jewelry with a rocker edge. Her Armenta collection of distinctive jewelry is a favorite of Hollywood's elite.