Black Glass Testing Stone, 2″ x 1-1/2″ x 6 mm, Item No. 56.714

Black Glass Testing Stone, 2" x 1-1/2" x 6 mm, Item No. 56.714

Economical black glass stone used with solutions and test needles to determine karat values.

Measures: 2″ x 1-1/2″ x 6 mm

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