What is the most valuable gemstone on the planet

The value of gemstones can vary greatly depending on several factors including rarity, quality, size, and market demand. Historically, diamonds have been one of the most valuable gemstones, particularly those of exceptional quality and size. However, in recent years, colored diamonds, particularly pink and blue diamonds, have fetched some of the highest prices at auctions due to their extreme rarity and unique coloration.

Other highly valuable gemstones include certain varieties of colored sapphires, rubies, and emeralds. For instance, the Sunrise Ruby, a rare Burmese ruby weighing 25.59 carats, sold for a record-breaking price per carat for a ruby at auction in 2015.

Ultimately, the value of a gemstone is subjective and can fluctuate over time depending on market trends and demand from collectors and investors.