How do geologists and gemologists determine the origin of a gemstone, and why is the provenance of certain gemstones, such as Kashmir sapphires or Burmese rubies, particularly significant?

How do geologists and gemologists determine the origin of a gemstone, and why is the provenance of certain gemstones, such as Kashmir sapphires or Burmese rubies, particularly significant?
Admin 18 hours, 5 minutes ago in Gemstones
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