Stardew Valley Miner or Geologist | Pros and Cons
When buying corundum you just need to consult a specialist. Regarding labs, at least three companies in the world can give a comprehensive assessment of sapphires — Swiss Gübelin, SSEF and the GRS. But even the existence of such a report doesn’t help a non-gemologist to determine the real value of the stone. The decision is always yours.
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