“Mohs Scale of Hardness!”
(This list is only for "Setting of Gemstones"!)
Name of Gem Hardness Ease of Setting
Easiest Difficult
Diamond 10 1
Ruby 9 1
Sapphire 9 1
Alexandrite 8.5 3
Topaz 8 2 =>3
Spinel 8 4
Blue Topaz 8 3
Emerald 7.5ó 8 10
Andalusite 7.5 4
Aquamarine 7.5ó 8 4
Iolite 7 ó 7.5 5
Smokey Quartz 7 5
Amethyst 7 5
Tourmaline 7 ó 7.5 5
Citrine 7 4
Garnet 6.5ó 7.5 4
Onyx 6.5 ó 7 3
Tiger Eye 6.5 ó 7 3
Zircon 6.5 ó 7.5 3
Bloodstone 6.5 ó 7 3=>4
Tanzanite 6.5 ó 7 3
Peridot 6.5 ó 7 4=>5
Moonstone 6 ó 6.5 5
Hematite 5.5 <>6.5 6
Fire Opal 5.5 ó 6.5 8
Opal 5.5 ó 6.5 8
Lapis Lazuli 5 ó 6 9
Turquoise 5 ó 6 9
Malachite 3.5 ó 4 8
Coral 3ó 4 10
Pearl 2.5ó 4.5 10
Amber 2ó 2.5 10
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The “Rating of Ease of Setting”
is my own numbering system. Other setters might disagree with me, but I’m satisfied
with my own rating.
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