Armenta ring from the Old World Collection. Blackened sterling silver. 18-karat yellow gold Crivelli crosses. Emerald-shaped Aquaprase™ cabochon center, 13 x 9mm. Champagne diamond and black sapphire trim. 4. 26 total Aquaprase™ carat weight. 0. 28 total black sapphire carat weight. 0. 11 total champagne carat weight.