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Item #: 7496
  • Transline#: gt36
  • Size: 3 x 6 Color: Black
  • Sold Individually
Retail: $25.50
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Natural obsidian test stones give precise readings when testing for gold purity. Obsidian is a volcanic glass produced when lava becomes cold. It is been used for years to make the sharpest knives. Obsidian test stones, on the contrary to rougher test stones, have a perfectly smooth surface that provides more consistent and reliable readings.