A 6ct lab grown alexandrite sits effortlessly in the centre of this beautiful auroral ring. Set on a solid 18ct gold band and secured in a classic four prong setting, its large table facet allows light to pass through the stone freely resulting in vivid flashes of green and purple light. This unique colour changing property makes alexandrite one of the rarest and most sought after gemstones on the market, adding to the luxury of this ring.Single 6ct lab grown alexandrite. Octagon cut. Available from sizes A to Z including half sizes.Lab grown gemstones hold the same optical and physical properties as their natural counterparts and offer a superlative cut, colour and clarity. Size: 11.9 mm (0.47 in). Material: 18ct Gold. Total metal weight: 3.8 gr. 1 emerald cut lab grown alexandrite (12 x 10 mm) = 6 ct. Colour: Colour Changing. Stone cut: Emerald Cut. Anniversary: 55th Anniversary. Birthstone: June.