Hard currencies that are more expensive than gold include platinum, diamonds, whale baleen, and antelope horns.
1. Platinum: Platinum is a rare precious metal with high stability and corrosion resistance, so it is widely used in jewelry, medical equipment, chemical industry and other fields. The price of platinum is higher than that of gold because there is less supply of platinum and the trading volume on the market is smaller than that of gold.
2. Diamond: Diamond is an expensive gemstone. Because of its rarity and preciousness, it is considered to be a hard currency more expensive than gold. The price of a diamond depends on factors such as its weight, color, cut, and clarity. High-quality diamonds can cost hundreds of thousands or even millions of dollars.
3. Whale baleen: Whale baleen is a material used to make high-end paintbrushes and artist's strokes, and its price is higher than gold and platinum. Because most whale species are protected, baleen is in limited supply and therefore expensive.
4. Antelope horn: Antelope horn is a traditional Chinese medicinal material and is considered to be a good medicine for treating many diseases. However, the supply of antelope horns is limited and therefore very expensive, considered one of the hard currencies more expensive than gold.