Stone Hardness (Mohs)
Alexandrite 8.5
Amethyst 7.0
Andalusite 7.0-7.5
Aquamarine 7.5-8.1
Citrine 7.0
Diamond 10.0
Emerald 7.5-8.0
Garnet 7.0-7.5
Tsav. Garnet 7.0-7.5
Iolite 7.0-7.5
Jade 6.5-7.0
Lapis 5.0-6.0
Moonstone 6.0
Morganite 7.5-8.0
Opal 5.0-6.5
Pearl 2.5-4.5
Peridot 6.5-7.0
Ruby 9.0
Sapphire 9.0
Spinel 8.0
Tanzanite 6.5
Topaz 8.0
Tourmaline 7.0-7.5
Zircon 6.5-7.5