20X21 triplet loupe Options_With light Tests* stones of colour D

Tests* stones of colour D to J

A synthetic stone (it doesn't exist in nature as crystals that can be cut into gemstones)

Jade (Nephrite)

CALIBRATION: 50g weight required for calibration (not included)

This instrument will show you if a gemstone is singly or doubly refractive

20X21 triplet loupe Options_With light Tests* stones of colour DSummary 20X21 The 'standard' magnification for a loupe (for jewellery & gemstones, stamps & coins) is 10X. This one is 20X The diameter of the lens is 21mm* * useable diameter of this lens (allowing for the rim that holds the lens in place) 19mm Too see reviews of loupes, click here Detail This really is the largest high quality 20X loupe. Though even with this high quality triplet, they are at the limit of what can be done technically although the