That's weird. REcoin (backed by real estate) and Diamond world (backed by diamonds) are totally unknown in here. And are these registered companies in the US that issued their own 'ICO's'? I think they are and I don't think they did issue an ICO. At least not the same type of ICO we see in crypto at least.
updated my first post with some info about those US based ICO's
ReCoin is a new Ethereum-based cryptocurrency with Smart Contracts capabilities that provide the solution to any B2B, B2C or P2P real estate rental activities. The value of REcoin is guaranteed by American real estate assets, which are held in a trust equal to the value of all REcoins sold.
DRC Diamond Reserve Coin is backed by phisical diamonds which are the most reliable and fast growing assets already for more than 100 years.
Diamonds prices constantly grow just as the value of your funds.