It is worth 1 penny to the gram, extremely common, unprecious
A diamond, ruby or sapphire is said to be a "precious" stone. An amethyst is said to be a "semiprecious" stone. Semiprecious objects are therefore less valuable than precious ones.
My favourite semi-precious stone is the Amethyst.
Her ring has several semiprecious and precious stones. Semiprecious stones are not as valuable as precious stones.
precious
Semiprecious metals and gems have characteristics of precious ones, but are not totally the same
precious gems are rare and valuable and the semiprecious are not as rare
Semiprecious refers to gems having value, but not precious.
Semiprecious refers to gems having value, but not precious.
It is the most highly valued of the semiprecious quartzes.
Because it is not an extremely rare gem stone.
Amethyst
I think amethyst.