What are the top ten hardest stones in the world?

Answer 1

I am not an expert, but I was interested to know this answer myself, a while ago. My research led me to this:

Stones harder than Steel

1. Diamond - the hardest mineral on earth;

2. Corundum* (depending on color: Ruby, Padparadscha, sapphire);

2. Diorite* (not a precious stone, therefore rarely mentioned);

3. Chrysoberyl (depending on color: Alexandrite, Cat's Eye or Cymophane);

4. Granite (not a precious stone, therefore rarely mentioned);

5. Topaz;

6. Quartz;

7. Feldspar;

All the above stones are stronger than steel.

8. Apatite (can be scratched by steel);

9. Fluorite (can be scratched by steel);

10. Calcite (can be scratched by a coin);

The following two can be scratched by fingernail:

11. Gypsum;

12. Talc;

*I'm still trying to find out if Corundum is harder than Diorite, or vice-versa.

Answer 2

Some of the hardest stones in the world include diamond, moissanite, corundum (sapphires and rubies), spinel, topaz, chrysoberyl, quartz, beryl (emerald and aquamarine), garnet, and jadeite. These stones are valued for their hardness on the Mohs scale and durability in jewelry.