More Details Armenta ring from the Old World Collection. Signature Armenta oxidized sterling silver and 18-karat yellow gold. Pear-cut clear quartz and green turquoise doublet center, 19mm (3/4") long. Detailed with white/black diamonds, black sapphires, and green tourmaline. 33mm (approx. 1 3/8") long overall. 0.84 total diamond carat weight. Hammered gold band. Made in the USA.