In the Gemstone industry, there are many descriptive terms which are frequently used to differentiate gemstones. These technical-sounding terms can be confusing to a purchaser. Ultimately by having a greater understanding of the terms, it will help make better decisions over which unique gemstone best suits your needs. Here is some information about hardness.
Mohs Scale – Hardness of Gemstones
Mohs' scale of mineral hardness quantifies the scratch resistance of minerals by comparing the ability of a harder material to scratch a softer material. The Mohs scale was invented in 1812, by the German mineralogist Friedrich Mohs.
Mohs based his scale on ten minerals, each given an arbitrary scale of hardness assigned with a number from 1 to 10.
Talc is the softest mineral and assigned 1 and Diamond is the hardest mineral and is assigned 10. All gemstones fall in between this range. For example, Labradorite Gemstones are a 6, Orange River Quartz gemstones are 7 and Topaz gemstones are 8.
Amethyst Gemstones are known as the stones of friendship.
What better way to bestow friendship that to give a beautiful Amethyst Gemstone Necklace to that special friend.
However, a word of caution. Make sure that the Amethyst Gemstone Necklace is handmade and constructed from faceted Amethyst Gemstones! Only Faceted Amethyst Gemstones truly reflect the seductive colour that the gemstone can offer.
G.A.E.A. facet beautiful 
Harlequin Gemstones