What is the most valuable gemstone?

The most valuable gemstone in the world is the Pink Star diamond, which was sold for a record-breaking $71.2 million at an auction in 2017. This rare and highly coveted gemstone is a 59.60-carat internally flawless pink diamond that was mined in South Africa. Pink diamonds are among the rarest gemstones in the world, with only a small percentage of diamonds exhibiting a pink color. The Pink Star diamond is considered one of the most precious and desirable gemstones due to its stunning color, clarity, and size.