Handcrafted jewels, using silver, gold, precious and semi precious stones › Black Onyx necklace with 18kt gold Image 1 of 1 Black Onyx necklace with 18kt gold $395.00 HandmadeBlack Onyx necklace with 18 kt gold. Length of necklace 24.5 ins / 62.23 cms. Add To Cart Added! HandmadeBlack Onyx necklace with 18 kt gold. Length of necklace 24.5 ins / 62.23 cms.