Unlike precious opal

An everyday carry stone—dense enough to feel substantial

and a green aventurine sphere

formed through geological heat and widely used in ornamental work since antiquity

Principal sources: Brazil

The Rest Stone Set Green Aventurine Unlike precious opalFive stones selected from different mineral families, each with a long history in calming and quieting practice. Howlite is a calcium borosilicate mineralbright white with grey veining, Mohs 3. 5, prized for its matte, absorbent surface. Amethyst is the violet variety of quartz, colored by trace iron and natural irradiation, Mohs 7. White Aventurine is quartz with fuchsite mica inclusions that produce a gentle shimmer. Prehnite is a pale green calcium