This ring is 2.5 micron plated 18ct yellow gold on Sterling SilverThe stone is a white synthetic heart opalComposition: 18ct yellow gold on Sterling SilverColour: GoldDimensions:The stones are 10 x 10mmDepth: Depth: Please see guide for jewellery care and Sizing: Jewellery Care & Sizing | Rosie Fortescue Jewellery