1.544 – 1.553
||May be enhanced
Brazil, India, Russia,
|Warnings for Care
||Colour change may occur with mild – moderate heat
The name Aventurine comes from the Italian phrase "by chance". The story goes that Venetian glass-makers around 1700 accidentally mixed copper filings in with the glass they were making, and the result was a green coloured glass that shimmered. Aventurine, a natural member of the Quartz family, also exhibits this phenomenon, and so the gemstone got its name.
The gemstone now give its name to the term Aventursecence, caused by the presence of platy mineral inclusions that give a shimmering or glistening appearance to gemstones.
Aventurine - What Causes the Colour
Aventurine, is an interesting stone in that it has two colours, ie a body colour and an iridescence colour.
The main causal agent for body colour in Aventurine is iron, which produces a range of colours from pinkish purple, through purple to violet, and golden brown to Green. Green Aventurine (Prasiolite) can be produced by the heat treatment.
Aventurine contains small inclusions of one or several shiny minerals which give the gem a glistening or shimmering effect. The color of this aventurescence depends on the platy mineral included in the gem and imbibe the stone with its iridescent glow. Mica inclusions give the gem a yellow or silver glitter or sheen. Hematite and Goethite inclusions give the gem a red or grey glitter or sheen. Chrome-green fuchsite mica inclusions give the gem a green sheen, this being the most common variety
Aventurine ranges in color from green, peach, brown, blue and creamy green. Where the colour is not stated with the word Aventurine, it is assumed to be green.
Aventurine is a daylight stone; under artificial light the iridescence is not well displayed. The true character of the stone is best viewed in the early morning or evening, when the light is soft and warm and the shimmering inner glow of this interesting gem are best displayed.
All examples are either opaque or translucent ( in very thin pieces).
Most Aventurine material is carved into beads and figurines with only the finer examples fashioned in en cabochon cuts for jewellery.
The majority of the worlds green and blue-green Aventurine comes for mining operations in India. Creamy white, gray and orange material is found in Spain, Chile and Russia.
Common Aventurine Treatments
Green Aventurine (Prasiolite) can be produced by the heat treatment. The heat treatment to 878-1382 degrees F (470-750 degrees C) results in light yellow, golden yellow, red-brown, green or colourless varieties of Aventurine being produced.
Important & famous Aventurine
In the past, green Aventurine has been labeled Indian jade, and some early examples were misidentified leading to this relatively inexpensive gemstone being highly prizes in the East.
Aventurine The Legend
Many modern crystal healers believe that Aventurine has the capacity to bring inner peace to a trouble spirit, and balance emotions. It is also believed to endow the wearer with strong intuitive power.
Precious Semi-Precious Gemstones