The Presidium Carat Scale-50 is the first portable carat scale to be certified “Legal For Trade” by the U.S. National Conference of Weight and Measurement.

The Presidium Carat Scale-100 is an affordable convenient scale that measures gemstone weights up to 100 carats with conversion to grams (20grams).

Learn more>>


A compact and sturdy engraving machine that provides ease of customization by engraving lettering on inside ring surfaces.

Learn more>>

Synthetic Diamond Testers