Just in case you didn’t know here are the top 10 gemstones in order of Hardness
1. Diamond
2. Sapphire
3. Ruby
4. Emerald
5. Alexandrite
6. Topaz
7. Spinel
8. Zircon (CZ)
9. Garnet
10.Aquamarine
Diamond is the hardest natural element know to man but there are harder materials but they are man made the hardest being a material known as ADNR or Aggregated diamond nanorods see picture
. As you can see it is about as desirable to wear as a Gaulstone so I think we should stick to wearing gemstones (Mother nature is far better at it than we are) and it seems that scientist don’t do pretty other than pretty ugly when it comes to materials. Still I don’t suppose they created it for us to wear and after all beauty is in the eye of the beholder.