Natural testing stones are used with solutions and test needles to determine karat values of precious metals. The stones are high quality and very economical.
Measures: 2-1/2″ x 1- 1/2″ x 6 mm
Natural testing stones are used with solutions and test needles to determine karat values of precious metals. The stones are high quality and very economical.
Measures: 2-1/2″ x 1- 1/2″ x 6 mm
