Are your gems natural, or are they treated or enhanced in any way? All our stones are 100% natural unless declared. For example if a sapphire has been subjected to heat treatment, it would be declared on its certificate. Post navigationPrevious post: What are Conflict Diamonds, Blood Diamonds and how can I be sure to not buy them?Next post: Why should I use Spheni Switzerland’s Bespoke Jewellery Service?