Answer: The most expensive gemstone per carat is the pink diamond. Pink diamonds are among the rarest and most sought-after gemstones in the world, and their prices can reach astronomical levels at auctions and in the gemstone market.
Explanation: The value of pink diamonds is influenced by factors such as the intensity of their color, clarity, size, and origin. In recent years, pink diamonds from the Argyle mine in Western Australia have gained significant attention, especially since the mine closed in late 2020, further adding to their exclusivity and value.
Keep in mind that the prices of gemstones can fluctuate over time due to market dynamics and availability. Therefore, it is always best to check with reputable sources or gemstone experts for the most up-to-date information on gemstone prices.