GUARANTEE REXdiamonds Guarantee PRICE REXdiamonds offers only the highest-quality products without the high mark-ups traditional retailers charge. Being diamond producers ourselves - our diamonds come straight from our mines - we are able to offer an outstanding selection of products at attractive prices. DIAMONDS All diamonds of 1 carat or more will be independently inspected and certified by the HRD (Diamond High Council) or GIA (Gemological Institute of America). GOLD All gold used by REXdiamonds.com is hallmarked to guarantee the purity of the metal used. A hallmarked piece indicates that the piece has been checked for purity - that is, having the minimum content of the precious metal. This mark is known as the Standard Mark. All gold that we use to manufacture our jewellery is 18 kt. THE REX BRAND Larger selected stones (above 1 Ct.) are laser inscribed with a numbered REX logo. This numbered logo is printed on the GIA certificate. The laser inscription on the diamond combined with the certificate gives you a perfect guarantee of quality and authenticity. A laser inscribed REXdiamond grows forever! REX always offers you the opportunity to upgrade your laser inscribed REXdiamond for a more valuable one.