Rhinoceros horn is a very precious item. It was regarded as a treasure in ancient China and was used to make handicrafts and medicinal materials. However, modern laws stipulate that rhinos are endangered wild animals, so the trade and collection of rhino horn products have been banned.
As for whether rhino horn cups from the Qing Dynasty can be auctioned, this requires reference to local laws, regulations and relevant policies. In some regions and countries, the auction of rhino horn products is prohibited, while in others it may be legal. Therefore, if you have such items, please first consult the relevant local departments or professional organizations to understand the relevant laws and regulations.
In addition, the price of rhino horn is also strictly regulated. According to the information I have, the price of rhino horns varies depending on the year, place of origin, quality, etc., but overall it is very expensive, usually ranging from thousands to tens of thousands of yuan per gram. However, please note that due to the rarity and endangered nature of rhino horns, prices are constantly changing, and specific prices need to be determined based on market conditions and relevant policies.