18ct Yellow Gold Whitby Jet Ruby Diamond Octopus Necklace. PTV151. This adorable octopus necklace is hand made in 18ct Yellow Gold. The pendant is set with pave Rubies totalling 0.39 carat and three sparkling Diamonds which hang gracefully from the end of the Octopus tentacles. The Diamond weight totals 0.15carats. This fabulous design also features two hand carved Whitby Jet gemstones as the Octopus's eyes, making this a very special piece indeed. The necklace is supplied complete with an 18ct White Gold chain. 18ct Yellow Gold Whitby Jet Ruby Diamond Octopus Necklace. Octopus 17x17mm