Amethyst 10-14mm butterflies and bows beads (ETB00310) Lavender Amethyst which were made by a

which were made by a marine wood-boring bivalve

Indian Paint Jasper

but a ruby without any needle-like rutile inclusions may indicate that the stone has been treated

dark version of the multi-colored stone

it is black/grey/white with distinctive spots/dots spreads across the stone

Amethyst 10-14mm butterflies and bows beads (ETB00310) Lavender Amethyst which were made by aAmethyst is a violet variety of quartz often used in jewelry. The name comes from the Ancient Greek a ("not") and methustos ("intoxicated"), a reference to the belief that the stone protected its owner from drunkenness. The ancient Greeks and Romans wore amethyst and made drinking vessels of it in the belief that it would prevent intoxication. It is one of several forms of quartz. Amethyst is the traditional birthstone for February. (wikipedia)