Books: Wrote The Teachings of Don Juan: A Yaqui Way of Knowledge.?

Questions

On which scale is the hardness of minerals measured?

What is the name given to the way in which stones such as diamonds are cut so as to have facets which reflect the light in different directions?

What did a pouncet usually contain?

Of which precious stone is aquamarine a variety?

Carat is the internatinally standardised unit of weight for precious stones what is its equivalent in grams?