In the 1970s, Hamilton created many pieces of jewelry in gold with inlays and accents of hard stones such as malachite, carnelian, tiger's eye, mother of pearl, lapis, and others. Using these designs, we have created our 1970s collection in 18k gold, with design cues from the period including_ beaded design frame, adjustable length fittings, to be worn shorter or longer over a collar – great for warm or cool weather outfits. Specially designed clasps made in Italy. This necklace features 13 black onyx gemstones. Handmade in 18k yellow gold. 36 inches long.