Hardness Pencil from 4 to 9 Mohs for Gemstone

Specification:

1. The Hardness Pencil: Fluorite-4,Apatite-5; Orthoclase-6; Quartz-7; Topaz-8; Corundum-9.

2. Mohs Hardness:4-9, 6pcs in box,

3. Gift box package

Those minerals are mounted in five metal pole respectively,use the corner of those mineral to scratch the gem,you will get the hardness according to the nick you scratch,

If there is a nick after you scratched, the sample's hardness is lower than the standard hardness pencil; If there is no nick after you scratched, that means the sample's hardness is higher than the standard hardness pencil.

Hardness pencils are pencils with a tip made of one of the 10 minerals on Mohs scale.
These pencils are used to try and scratch a stone and observe if the pencils can scratch the gem. Since this is a destructive method (it leaves a scratch)

8pcs in 1box.