Buy lab grown diamonds in UK with complete confidence at Astar Diamonds – the UK’s trusted source for certified, sustainably created diamonds that are chemically and optically identical to mined stones, yet up to 70% more affordable. Explore our stunning collection of loose lab-grown diamonds and ready-to-wear engagement rings, eternity bands, earrings, and pendants, all IGI or GIA certified, available in every color, cut, clarity, and carat weight you desire. Enjoy free UK next-day insured delivery, 30-day returns, lifetime warranty, and 0% finance options.