Blue Nile
4.4 / 5Online
Blue Nile carries a very large loose-diamond inventory, well over 200,000 stones, searchable by shape, carat, colour, clarity and price, with GIA-graded options throughout. You can start with a diamond and add a setting, or start with a setting, which makes the stone-first route straightforward. It's one of the older online diamond sellers and ships internationally.