A diamond and onyx necklace by Bvlgari, from the 'Bvlgari' collection, with three reversible onyx and diamond set discs suspended on integral chain, in 18ct white gold, total length 390mm, boxed.
onyx. Onyx is a form of agate. European onyx is generally green, but can be many other colours, and can contain bands of black and/or white.
This multicoloured stone is widely used for table tops, lamp bases and in jewellery. Some types of onyx are also used for cameos of which the upper white layer is cut away to reveal the colour beneath.
The buyers premium is an additional percentage charge on the hammer price of the item, imposed by the auction house to cover administrative costs. The buyers premium percentage varies between auction houses, with a range of 12.5% to 22%.