C. 1960. From our Estate collection, this unique sphere necklace has a fabulous, futuristic spirit. Glowing 4.5mm cultured pearls and bright… C. 1960. From our Estate collection, this unique sphere necklace has a fabulous, futuristic spirit. Glowing 4.5mm cultured pearls and bright 3mm howlite and aventurine beads decorate the dimensional pendant set in brushed and polished 18kt yellow gold. Suspends from a classic cable chain. Lobster clasp, aventurine, howlite and white pearl sphere pendant necklace. Exclusive, one-of-a-kind Estate Jewelry.