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The Syrian rhetorician Lucian (c. 125–180 CE) describes a statue of the Syrian goddess Atargatis in Hierapolis Bambyce (present-day Manbij) with a gem on her head called Greek lychnis (λύχνος, "lamp; light") (Schafer 1963: 237). "From this stone flashes a great light in the night-time, so that the whole temple gleams brightly as by the ...
However, since rutile is present in most common star gemstones, these are almost never completely transparent. A distinction can be made between two types of asterism: Epiasterism, such as that seen in sapphire and most other gems, is the result of a reflection of light on parallel arranged inclusions inside the gemstone.
Iridescence is the 'play' or 'fire' of rainbow-coloured light caused by very thin regular structures or layers beneath the surface of a gemstone. Similar to a thin film of oil on water, these layers interfere with the rays of reflected light, reinforcing some colours and cancelling others. Iridescence is seen at its best in precious opal. [14]
Before buying any old gem, though, keep reading to uncover the 25 most popular gemstones—and their meanings. Agate “Agate is earthy, warm and rich,” Salzer says, noting that it exists in ...
A gemstone (also called a fine gem, jewel, ... Daylight, often called white light, is all of the colors of the spectrum combined. When light strikes a material, most ...
The art of cutting a gem is an exacting procedure performed on a faceting machine.The ideal product of facet cutting is a gemstone that displays a pleasing balance of internal reflections of light known as brilliance, strong and colorful dispersion which is commonly referred to as "fire", and brightly colored flashes of reflected light known as scintillation.
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