Blue Diamond
Blue diamonds are among the most expensive gemstones per carat. Their value comes from intense natural color, rarity, and high demand at auction. The Hope Diamond, a famous example, is valued in the hundreds of millions of dollars.
Red Diamond
Red diamonds are exceptionally rare, with most specimens under one carat. Their price per carat often exceeds that of colorless diamonds. The Moussaieff Red is one of the largest known red diamonds and has sold for millions.
Musgravite and Taaffeite
Musgravite and taaffeite are ultra-rare gemstones that command extremely high prices. Musgravite was first found in Australia, while taaffeite was identified in Sri Lanka and Tanzania. Both are valued by collectors and can cost tens of thousands of dollars per carat. For more details on rare gems, see https://www.gia.edu/gem-reference/gem-price-guide.
