cabochon, en cabochon Gem with a rounded top, without facets. French, "little head."
carat Unit of weight in gemstones, one-fifth of a metric gram
cat's-eye Phenomenal effect in cabochon cut gemstones resembling the iris of a cat's eye.
Coral is cut en cabochon or used for beads and sometimes small carvings. Beware of imitations, such as coloured shell or bone.
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Moh's ...
A garnet cut en cabochon
Casting
Process of forming an object by pouring a molten or liquid substance into a mould until it solidifies and takes on the impression of the mould ...
Sunstone is cut en cabochon when it is opaque, but transparent gem varieties can be faceted as well. The most desirable effects of aventurescence are achieved when the sunstone is cut on its optimal crystal axis.
19:27, 12 November 2011 (hist) (diff) N Carbuncle ‎ (Created page with 'A large almandine garnet that is cut ''en cabochon.'' These deep purplish-red garnets were popular in Victorian jewelry. category:glossary') (top) ...
or rectangular facets, sometimes pierced at the top, also known as 'drop-cut' Bronze An alloy of approximately 8 parts copper to 1 part tin Buff top cabochon Style of stone cutting where the top of the gemstone is a dome (en cabochon) and the ...
Step or brilliant cut; heavily flawed or star stones are cut en cabochon.
Much ruby rough is shallow; many cut stones are shallow as a consequence. Because of strong dichroism, the best color is attained by cutting the table normal to the c-axis.
Jade is often cabochon set; stones with imperfections are often carved (the imperfections are simply carved away). Two different minerals are known as jade: jadeite and nephrite.
An almandine (garnet) that is cut en cabochon.
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When such a stone is cut en cabochon these rutile needles or 'silk' brings about the rare cat's eye effect or the very desirable asterism (a six rayed star that shimmers above the stone's surface when it is moved).
Transparent stones of clean color have been faceted, and chatoyant specimens have been cabochon cut.
They are generally cut en cabochon, but is often cut into round pieces for necklaces and pendants. Tiger's-eye is also used for carvings, boxes, ashtrays and other similar pieces. When the color is a greenish grey, they are called cat's-eye quartz.
Opal: An opaque, translucent or transparent gemstone, always cut en cabochon and sometimes carved. White, grey, yellowish to black body colour. In the finer qualities, opal displays all spectral colours in pin-fire, patchwork or flash patterns.
When cut en cabochon, this produces a very sharp linear reflection of light known as the cat's-eye effect. Fine, large catseyes are rare and costly.
Cornelian is usually cut in beads or en cabochon. The stone has its use in intaglios and cameos. It is actually silicon dioxide with the specific gravity ranges in between 2.65 to 2.66.
Gems cut en cabochon are shaped and polished, rather than cut. In antiquity, this was generally the only cutting option available other than using the gem with the natural facets of their crystal structure.
This stone was set in a ring and is said to have been an opal cut en cabochon and "as large as a hazel-nut." The ring was taken to Constantinople, where it was estimated to be worth "several thousand ducats.
It is frequently cut with a convex face, or en cabochon, and is then known as carbuncle. Viewed through the spectroscope in a strong light, it generally shows three characteristic absorption bands.
The gems are usually cut en cabochon in order to best display their chatoyancy. The color gives the stone its name: honey colored stones are called ‘Cat's Eye, grey-blue stones are called ‘Hawk's Eye'.
The name given to a gem which when cabochon cut shows a single light streak across its face. A semi-precious variety of quartz found in South Africa, it may be yellowish-brown , bluish, or red in color.
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Malachite is often cabochon cut because of its opaque body. Malachite gets its name from the Greek word Malake meaning "mallow", in reference to its low hardness. Do not clean this stone in abrasive gem cleaner, use a polishing cloth. Learn more>>> ...
CAT'S-EYE. A term applied to gem minerals which, when cut convex (en cabochon), display a band of light, usually across inclusions of parallel fibres of asbestos; name derived from resemblance to the eye of a cat.
Some rubies when cut en cabochon give a cat's eye or the very desirable asterism-a 6 rayed star which moves over the surface when stone is moved.
When chrysoberyl is of fibrous or tubular internal structure it affords cat's-eyes (when cabochon cut), and these should be specifically named as "chrysoberyl cat's-eye" to distinguish them from the less beautiful and less valuable quartz-cat's-eyes.
Star effect seen in some stones when cut en cabochon.
Australian Opal Australian opal is classified into five main types ...
The deep red of Bohemian Garnet was hugely popular in the late 18th and 19th Centuries and examples of these stones cut small and en cabochon, and clustered together on brooches, hair pins and rings can be found in many antique shops and markets.
Star sapphires usually have six ray stars, but twelve ray stars are also known. Rarely, when sapphires are cut en cabochon, they can demonstrate a cat's eye effect.
Stones were cut en cabochon and were irregular in outline. This was attained by not cutting facets into the stone, but smoothing its natural shape with the result being a flat underside for easy setting, and a rounded top to display more color.
Cabochon
Gem cut and polished to have a domed outer surface. Such stones are said to be cut en cabochon.
Jewelry Frequently Asked Questions
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Gemstones are cut en cabochon for a number of reasons. The first, and most important, is to demonstrate special optical properties such as cat's eyes and stars. The second use involves gemstones and gem materials that lack transparency.
Asterism: The star effect displayed by certain gems with properly intersecting inclusions. Gems of this variety are always cut en cabochon (see Cabochon cut).
Baroque: Odd-shaped pearls formed during cultivation.
Tiger's eye - A semi-precious variety of quartz found in South Africa, in yellowish-brown, blue or red. When cabochon cut, shows a single light streak across its face ...
Gemstone Uses: Opal is amired for its distinctive play of colour and for this reason is often cabochon cut.
Gemstone Care: ...
These almandite garnets are translucent, purplish-red stones that show four- or six-ray stars when cabochon cut, or are transparent, deep red stones that can be faceted. The asterism is the result of silky rutile inclusions.
Some Mexican, Peruvian and crystal opals are faceted and these tend to exhibit a sleepy, milky appearance on colourless or coloured bodycolour
Most are cut en cabochon, ...
Gemstones ruled by Ketu include Cat's eye chrysoberyl, beryl, apatite,tourmaline and other yellow to greenish-brown gems which display a strong chatoyant "cat's eye" light reflection on the surface and often within the crystal when cabochon cut.
opal (n) a mineraloid gemstone which can be found in an array of colours. Rarely it is red and black; commonly it is white with a colourful opalescent effect. This effect is best produced when opals are cut en cabochon.
When cut properly en cabochon, a six rayed star emerges from the bronze Schiller effect. Similar material is found in Madagascar. These and other dark star beryls can resemble black star sapphires.
 See also: Cabochon, Cut, Stone, Gemstone, Jewel
  
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