What is the biggest gemstone ever found?
The biggest gemstone ever found is called the Culling Diamond. It's owned by the British Royal family and is part of the royal Crown Jewels.
What is the most expensive (valuable) gemstone in the world?
The Pink Star Diamond is the most expensive gem in the world. It cost $71.2 million US dollars. It was mined in South Africa in 1999.
Who found the first gemstone?
The Ancient (very old) Egyptians found the first gemstones. They used gemstones like Lapis, Carnelians and turquoise in their royal jewellery.