How can you compare the diamond and crypto-coin prices? The units are different. Some people compare gold and BTC, by taking one BTC against 1 oz. of gold. Here also, you can compare 1 BTC with 1 carat of diamond. Right now, 1 BTC is worth around $4,350. One carat of diamond is worth anything between $3,000 and $30,000 depending on the quality.