Setting your sights on a new Omi PrivĂ© piece is like experiencing Christmas—the anticipation builds until that day you’re finally able to open those presents you’ve long been eyeing. And this latest piece from Omi—clearly—doesn’t disappoint. The American Gemstone Society adds further options: alexandrite for June was superb and they used to go for whole suites of jewellery, not just single rings." As always, whether you're buying or selling, go to a trustworthy dealer, preferably a But while their rarity would logically make them the most precious of minerals, many would not work in a Valentine’s Day ring setting but much rarer than the diamond. Black Opal, Alexandrite, Red Beryl, Kashmir Sapphire are some of the rarest .