ҮНЭТ ЭРДЭНИЙН ЧУЛУУ Natural history museum of Mongolia
The simplest chemical structure of precious stones is diamond crystalline carbon This stone is the most valuable and hardest mineral in the world Its hardness is 10 on the Mohs scale The value of a diamond depends on the weight of the stone A maximum of 3 4 carats will be mined from 1 ton of ore 1 carat diamond can cost up to $ 10 000
