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Boulder opal, total weight: 9.80-carats; yellow and white diamonds, total weight: 0.11-carats. Lobster clasp fastening. Brooke Gregson pieces are made from natural materials and as such may have some flecks or scratches. This piece has been certified in accordance with the Hallmarking Act 1973. NET-A-PORTER.COM is a certified member of the Responsible Jewellery Council. Made in the UK. This item's measurements are: Drop: 21.5, Pendant Length: 3.0, Pendant Width: 1.0"Most are millions of years old and are mainly made up of water forming slowly over time with fossils and organic material," says Brooke Gregson of the boulder opal - her favorite gem. Handmade from 18-karat gold, this necklace is set with the iridescent stone and encrusted with white and yellow diamonds. Style yours with low-cut necklines. Colour: metallic