Although they are the rarest stones, they are not the most expensive
5th Transparent grandiderite – grandiderite is most often found in a slight blue colour, and is rare, but not enough to take fifth place. This belongs to its transparent variety.
4. paraiba tourmaline – Tourmalines are not rare stones in themselves, but their paraiba variety has an unusual colour reminiscent of the waters of paradise.
3.Larimar – this silicate is found only in the Dominican Republic. A small deposit of it has recently been discovered.
2. Black opal – normal opal, although valued, is not a terribly rare stone. What’s different is its black variety. Almost all of them come only from Australia.
1. Tanzanite – this stone is available only in Tanzania and only near Mount Kilimanjaro. Its deposits are running out and the chances of finding new ones are slim.