Blue Nile will only provide customers with the highest quality genuine gems. Our colored gemstones are rigorously inspected by our trained gemologists to ensure they meet our rigorous quality standards.
Because of its rarity and unique visual qualities, almost all of the fine jewels sold by high-end jewelers, including Blue Nile, have been treated with a variety of techniques. Many of these technologies have been in use for many centuries. Untreated colored gemstones are very rare and worth the price.
Our white diamonds and faux diamonds are not treated in any way except for normal cutting and polishing. Black diamond fashion jewellery is made from natural diamonds, which are specially treated to create a unique black tone.