The majority of gems are found in the Highland series and are associated with ancient alluvial deposits. The island originally was part of the southern part of Gondwana and was subsequently broken off and moved north with the Indian plate. The majority of Sri Lanka (90%) sits on Precambrian formations that date back to more than 2 billion years old. Sri Lanka, formerly known as Ceylon, is a small island located to the southeast of India with very distinct and interesting geological origins. Sri Lanka - The Jewel Box of the Indian Ocean
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