iolite cabochons 6mm

Qty

Iolite is a beautiful blue violet grey gemstone with strong trichroism; its colour differs when viewed from different angles.

Hardness (vs abrasion/scratching) 7-7.5/10

Toughness (resistance to fracture) poor (it can be brittle and has moderate cleavage)

Stability (resistance to chemicals, UV etc.) fair to good