7/2 · Quartz is one of the hardest gemstones. Tourmaline. The hardness can range from about 900 to 1000 on the Mohs scale of mineral hardness. Tourmaline is one of the hardest

9/8 · 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 Steel1. Diamond - the hardest mineral on earth;2. Corundum

Diamond is graded the hardest (10), followed by ruby and sapphire (9), topaz, emerald and spinel (8), and garnet, tourmaline and quartz (7). The softest stones 

This DLC will add more 50 levels to the Mighty Gemstones games. These are the hardest levels of the game. The difficulty will increase even more as you complete levels. Features. - Big challenge, hard levels to complete. - Much more entertainment. - New achievements to unlock.

Diamond is a 10 on the Mohs Hardness Scale and is four times harder than corundum ( sapphire and ruby) at nine. Topaz, at eight on the Mohs Scale, is half as hard as corundum above it. Faceted ruby: Mohs Hardness rating of nine. Faceted topaz: Mohs Hardness rating of eight.

Although diamond is the hardest natural substance on earth, it is rated as 'good' for toughness as if it is hit at a certain angle, it can fracture and cause 

It is one of the key qualities of a gemstone. Diamond is the hardest gemstone. The second hardest gemstone is corundum (ruby and sapphire).

The diamond is the hardest natural gemstone in the world and measures a ten on the hardness scale. Gemstones measured at a one can be easily scratched with 

A gemstone is a piece of mineral crystal which, in cut and polished form, is used to make Most gemstones are hard, but some soft minerals are used in jewelry 

8/15 · 10. Gypsum. Gypsum found in Poland. Mohs hardness: 2. Absolute hardness: 3. Chemical formula: CaSO 4 ·2H 2 O. Gypsum is a sulfate mineral composed of calcium sulfate

Diamond is the hardest known natural mineral according to the Mohs scale. Its hardness depends on its purity, and the hardest diamond can only be scratched by other diamonds. Some blue color diamonds are natural semiconductors, some are electrical insulators, and the rest are electric conductors.