One of the biggest and best-known ethical jewellers is Brilliant Earth, which was set up nine years ago to design and sell ethically produced engagement rings and other fine jewellery. The company uses only ethically sourced metals and coloured gemstones, all fully traceable back to the original source, as well as recycled gold, silver and platinum. It also sells a selection of vintage rings - another, often overlooked way of staying true to your ethical principles as well as securing a truly unique piece of fine jewellery.