1. Scarce. "Things are rare", gold and diamonds are scarce, but gold is a non-renewable resource, and diamonds can be artificially synthesized. Its value is completely different, of course, the scarcity of natural diamonds is still great. However, compared with diamonds, gold is more scarce.
2. Liquidity. As a special currency for reserve and investment, the international gold transaction price is highly transparent. As long as the gold purity is sufficient, the general jewelry store will recycle it, which means that the gold transaction is very convenient and can be realized at any time. Diamonds are difficult to identify and need to be very professional, so many jewelry stores will not recycle them. Even if they are willing to recycle, the price of recycling will be much lower than the price of buying diamonds.