basket Your basket >
>
Your wishlist >
reset search

We offer layaway, spread payments on the piece of your dreams. Ask us for details.
Free insured shipping on all orders !!!

jewelry glossary

Antique jewelry glossary

Welcome to our extensive antique jewelry glossary with around 1,500 jewelry related entries.If you feel you are missing an explanation, feel free to let us know and we will add it.

A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z     all

Asterism

asterism

More info: Precious stones.

An optical phenomenon of a star-like figure that is seen in some crystals by reflected light or transmitted light. An example is the 6-ray (sometimes 4-ray, 8-ray or 12-ray) star-like figure that is observed by reflected light in some gemstones (especially the star ruby and the star sapphire) when cut en cabochon in such a manner that the greatest thickness of the stone lies parallel to the vertical axis of the crystal.

The effect is caused by the reflection of light from a series of microscopic fibrous inclusions or small canals lying within the crystal parallel to the prism faces and arranged in three directions that intersect, usually at angles of 60°.

Such stars are also seen in some other gemstones, e.g. beryl, almandine, star opal, rose quartz.

A stone showing asterism is known as an asteria or a 'star stone'.

From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson

Jewelry Glossary

Missing an explanation?
click here to request one

Jewelry Theme Search
Antique Jewelry Lecture
Adin Wallpapers    Help    Shipping Policy    Dealer Terms    Special Requests    Follow us on :   Twitter   Facebook   Google+   Instagram   Links
Home  |   Site Security  |   Track your Order   |   Return Policy   |   Contact Us  |   Antwerp  |   Terms And Conditions   |   Site Map  |   Blog  |   Testimonials  |   In Memoriam