Malachite

Malachite was a gemstone distinguished by its green stripes of many shades, similar to the blue azurite.

Description
Striking in appearance and inexpensive, these ornamental stones were usually tumbled smooth or cut cabochon and polished for jewelry among those that could not afford much more. Malachite was reputed to help prevent falls and therefore was often used on devices like rings of feather falling. A typical specimen had a base value of 10 gp.