18kt Rose Gold Pendant with Cognac Diamonds and Australian Boulder Opal Boulder Opal and Diamond Pendant Necklace in 18k and 14k Yellow Gold 18kt Rose Gold Pendant with Cognac Diamonds and Australian Boulder Opal Tiffany and Co. Semi Black Boulder Opal Diamond Yellow Gold Pendant For. A beautifully handcrafted pendant featuring a luminous 7. 28ct solid white opal, accented by a round brilliant cut cognac diamond in a refined bezel setting. Crafted in 18ct yellow gold, this piece balances organic beauty with understated luxury. Designed and made in our Hobart workshop using responsibly sourced materials. Available in store. Please contact us to enquire. DETAILS Solid white opal, 7. 28ct Cognac diamond, 0. 12ct (C4C7) 18ct yellow gold 37mm x 14. 9mm (including bail) Chain sold separately CUSTOM MADE Love this design? Enquire about creating your own bespoke piece with your choice of gemstone and metal. Email info@sargisons. com. au or simply visit us in store.