what properties do gemstones have
Only 10 or 12 of the major gemstones have the ideal hardness, which is greater than 7. This ideal hardness designation stems from the fact that quartz (H=7) is the most abundant mineral on Earth and present as tiny particles in the dust that settles on jewelry, which can lead to scratching and abrasion.nly 10 or 12 of the major gemstones have the ideal hardness, which is greater than 7. This ideal hardness designation stems from the fact that quartz (H=7) is the most abundant mineral on Earth and present as tiny particles in the dust that settles on jewelry, which can lead to scratching and abrasion.