The Sapphire cluster weighs around 2.5 million carats or 510 kilograms. As per the experts, the cluster has an estimated value of up to $100 million in the global market.
source https://www.jagranjosh.com/current-affairs/worlds-largest-star-sapphire-cluster-worth-up-to-100-million-dollars-accidentally-found-in-sri-lanka-1627551004-1