The aventurine, or aventurine quartz, is a stone of the quartz family. It can be found in several shades of colors, ranging from green (due to the presence of fuschite) to brownish-red (due to the presence of hematite). Significant deposits are found in Brazil, India, Russia and Tanzania.

Gold stone as it is commonly called is often considered as a precious stone but it is not one. In truth, it is a type of glass in which are integrated copper crystals. Under a reduced flame, copper and silica are mixed to make a bluish green colored glass. Once the mixture cools, the copper, through a thermic isolation process, creates minuscule copper crystals. The most common gold stone is semi-transparent and brownish red in color. It derives its color from particles of copper. The other types of gold stones (blue goldstone, purple goldstone, green goldstone) are obtained by adding cobalt, manganese or chrome oxides to a highly colored matrix of the corresponding ionic color. The crystals from these variants are more likely to be silvery. In english it has many aliases: aventurine glass, stellaria, sun sitara, monk’s gold or monkstone.

During Antiquity as well as Middle-Ages, it was believed that the formation of gems was influenced by constellations, some gems were as bright as stars. They were thought to be the mirrors of the cosmos. Therefore each planet was associated with one or more gems that possess “magical” properties. These beliefs still circulate in todays modern society, even though there are no tangible proof to support them.

Sign	Stones
ARIES	Carnelian, red jasper
TAURUS	Carnelian, pink quartz
GEMINI	Citrine, tiger's eye
CANCER	Chrysoprase, aventurine
LEO	Rock crystal, golden quartz
VIRGO	Citrine, yellow agate
LIBRA	Orange citrine, smoked quartz
SCORPIO	Blood red Carnelian
SAGITTARIUS	Sapphire, chalcedony
CAPRICORN	Onyx, rutilated quartz
AQUARIUS	Turquoise, falcon eye
PISCES	Amethyst, quartz amethyst