Jasper, a form of chalcedony, is an  opaque, impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to Iron(III) inclusions what is basically a chert. The mineral breaks with a smooth surface, and is used for ornamentation or as a  gemstone. Jasper comes in many different varieties and is very popular. It can be highly polished. Jasper is one of the traditional birthstones for March.

Orbicular Jasper aka Sea Jasper, 2 B Priced.
Orbicular Jasper, 2 B priced.
Orbicular Jasper Pendant drilled across the top, 2 B priced.
Imperial jasper $45.00 per strand.
Orbicular Jasper tube bead, 2 B priced.