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Link - https://www.bbc.com/news/world-asia-57981046 A gem merchant said the stone was found in the gem-rich Ratnapura area. Experts say the stone, which is pale blue in colour, has an estimated value of up to $100 million in the international market. The cluster weighs around 510 kilograms or 2.5 million carats and has been named the "Serendipity Sapphire". I have never seen such a large specimen before. This was probably formed around 400 million years ago," Dr Gamini Zoysa, a renowned gemmologist told the BBC.