More Details Armenta necklace from the Old World Midnight Collection. 18-karat yellow gold with blackened sterling silver detail. Doublet pendant with pav diamond trim in scalloped setting=. Faceted, round chrysoprase/moon quartz center. 0.15 total diamond carat weight. Adjustable cable chain, approx. 16-18"L. Pendant, approx. 0.5" (12mm). Lobster clasp.