... magnifier , *Triplet *Achromatic,chromatic aberration; *10X,21mm *Lens with rubber coating,comfortable 10x21 jewelry magnifier Jewelry regular instrument, ... plating metal crustGem Loupes mainly used to observe the surface character and internal features of gemstones.To test ... crystal plane,cleavage and jogged features.jewelry loupe is the ideal and regular tool in gemological laboratory.Shenzhen Fable ...