Diamond Digital develops a crypto-currency backed by diamonds. The crypto-currency is issued on the Ethereum1 Blockchain, and it follows both the ERC202 standard for interoperability and the suggested ERC621 3 standard for increasing and decreasing token supply. Ethereum smart contracts guarantee that there cannot be more DiamondCoins in the system than diamonds used as collateral. DiamondCoins can always be redeemed for auxiliary diamonds as a consequence. Diamond Digital began operation in 2017. It has headquarters in Feusisberg in Switzerland.