Chatoyancy or Cats Eye in your Gemmologist
Chatoyancy Description
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Chatoyancy: The ability of certain gems to display a "cat's-eye" effect, due to the precise occurrence of narrow inclusions. These gems are always cut en cabochon.
Chatoyancy
Cat's eye effect produced by some gemstones when cut properly in cabochon form. (see 'rutiles')
Crystal Structure
The orderly geometric spatial arrangement of atoms in the internal organization of a mineral specimen.
Chatoyancy
French for the cat’s eye effect observed in some gems, usually the result of parallel lines of needle inclusions within the stone. Doesn’t everything sound better in French?
Chatoyancy
The appearance of well-defined bands or threads of light across the surface of a gemstone. This appearance is caused by the reflection of light off small parallel mineral inclusions.
Chatoyancy The cat's eye effect sometimes seen in gemstones such as chrysoberyl, apatite and tourmaline is known by the technical name of chatoyancy.
Chatoyancy: Also know as the cat's eye effect, this is a reflection effect that appears as a single bright band of light across the surface of a gemstone, similar to the slit eye of a cat.
CHATOYANCY
Chatoyancy is the lustrous, cat's eye effect seen in some cabochon stones, like cat's eye, tiger's eye (pictured above), and sometimes in other stones, like aquamarine. In chatoyancy, light is reflected in thin bands within the stone.
CHATOYANCY. Changeable or undulating lustre or colour, as displayed by a cat's-eye.
CHIPS. Cleavage of diamonds of smallest fractions of a carat in use.
CLATERSAL. Diamond splints, which are converted into diamond powder by crushing.
Chatoyancy - Chatoyancy is the appearance of a shimmering light that moves across the surface of certain stones and appears as a narrow line similar to a cat's eye. This effect is most noticeable on a cabochon cut stone.
Chatoyancy: Alexandrite, Tiger's Eye
Asterism: Star Ruby, Star Sapphire
Luster: Pearl, Talc, Gypsum
Aventurescence: Sunstone, Aventurine
Adularescence: Moonstone (blue/white), Opal (milky white) ...
Chatoyancy: The effect in certain translucent stones when cut en cabochon that exhibit a streak of light which moves as the gem is moved. Caused by minute fibrous inclusions.
Chatoyancy
Commonly referred to as the Cat�s Eye effect, chatoyancy appears as a single beam of light through a gemstone.
Chatoyancy: This phenomenon is also due to reflection, but in this case, rather than involving plate-like inclusions scattered randomly, it is due to parallel thread-like reflective inclusions such as needles or tubes.
Chatoyancy:
An effect which resembles the slit eye of a cat caused by reflection of light by parallel fibers, needles or channels in the stone. Most effective in a cabochon cut. Most common is of chrysoberyl.
Choker: ...
Chatoyancy may occur in any color of the chrysoberyl but the most highly prized is the slightly greenish yellow or brownish yellow, a color similar to honey.
Chatoyancy
The cat's eye (thin line) like effect are a reflection of light on the inclusion, seen only on suitable stones, which are cut to cabochons with the inclusions in the correct directions.
chatoyancy (n) see cats eye.
choker (n) a close-fitting necklace worn around the neck. Cf. Necklace.
citrine (n) the yellow variety of quartz.
Chatoyancy refers to the reflection of light from bands of parallel fibers, which often impart a silky appearance to a mineral. When skillfully cut in a cabochon, a single band of light flows parallel to the orientation of the fibers.
CHATOYANCY - The phenomenon of a sharp, well defined band or streak of light across the dome of a gem material caused by the reflection of light from parallel needle-like inclusions.
CHATOYANCY A phenomenon caused by reflections from parallel needle like inclusions in a cabochon such as cat's-eye gemstone. Chatoyancy can be seen in some flat gemstones but a cabochon cut enhances the effect.
Chatoyancy is a special optical property that is highly prized by gem collectors. The phenomenon is caused by fibrous or needle-like inclusions that interfere with the passage of light.
Chatoyancy: A stone that changes luster in different lighting much like a cat's eye effect. They are usually cut in cabochon shapes to enhance luster.
Chatoyancy, appearing in these varieties of quartz, is caused by fibrous inclusions. They are generally cut en cabochon, but is often cut into round pieces for necklaces and pendants.
Cats Eye:A cabochon cut gemstone that displays Chatoyancy, a luminous, single line down the center of a gemstone, resembling a cat's eye. Cathedral:A ring setting that utilizes arches to support and showcase a center stone.
cats eye A mineral with dense inclusions of tiny, parallel, slender, fibers that may cause it to exhibit chatoyancy. The most notable cat's eye mineral is Chrysoberyl Cat's Eye, which is known simply as Cat's Eye.
Special effects, such as asterism, chatoyancy, adularescence and opalescence cannot be achieved without a cabochon cut. Calibre cut: A style of gemstone cut, usually utilized for small sizes.
The lamellae are almost parallel to one another and when sometimes perpendicular to the axis of the pearl result in a “pseudo-chatoyancy' effect.
Silky - A fibrous sort of luster, often display chatoyancy (Gypsum)
Silicates - Mineral containing silicon and oxygen, along with other elements.
Stones and crystals that go through this process are referred to as brecciated, creating a finished product with multiple colors, hues and superb chatoyancy
Gemstone Physical Characteristics: ...
Cats eye and star stones are known; chatoyancy due to oriented, tubular, fluid inclusions.
Heat treatment and irradiation have highly unpredictable affects; very different results for same colored stones from different localities.
Tiger's eye is usually highly polished and set as a cabochon (or cut as a bead) to display the stone's chatoyancy (light reflected in thin bands within the stone).
Charoite is so unusual looking with its chatoyancy and strange looking spirally strands of fibrous material that it is often mistaken for a synthetic. It is used extensively in jewelry and as an ornamental stone carved into boxes, bookends and vases.
Chatoyancy or the cat's eye effect is a reflection effect that appears as a single bright band of light across the surface of a gemstone. It is caused by the reflection of light by parallel inclusions.
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 optical effect, known as chatoyancy, is caused by the reflection of light from thin, closely spaced filaments in parallel arrangement within the mineral.
Most cat's eye on the market is synthetic
Color range is endless ...
This property of stone is known as chatoyancy. It is a brown quartz silicon dioxide having lustrous yellow and brown parallel fibers. The presence of iron oxides gives the stone the color of yellow-gold.
Glass beads made by any of three processes that results in a changing luster and apparent moving line similar to the chatoyancy of a natural cat eye stone like tiger's eye. Fiber optics have been used extensively in costume jewelry in recent years.
Fibrous gold to red-brown coloured quartz, exhibiting chatoyancy.
Rock crystal or mountain crystal
Clear, colourless ...
The unique appearance of tiger's eye is caused by fibrous inclusions. Light is refracted off of these inclusions giving tiger's eye its chatoyancy (changeable luster).
TIGER'S EYE
Color ...
Peacock feathers
Butterfly wings
Colored silk threads[1]
Engraved metallic foils to mimic asterism and chatoyancy[1] ...
Normal Chrysoberyls and alexandrites occur in a variety of standard cuts
Cat's eye chrysoberyl occurs in cabochon due to the nature of the effect (chatoyancy)
Care & Collecting ...
These rare and beautiful effects very often add value to gemstones. Some of these popular phenomena are Chatoyancy (cat's eye effect), Asterism (star effect), Color Change, Aventurescence and Iridescence.
The Tiger's Eye is a cut "en cabochon". The term "en cabochon" is used in describing the cut stones with convex top and flat bottom. This actually helps in displaying the vertical stripes or bands known as chatoyancy.
type insects, Chinese "aeroplanes" looking like characters from Chinese writing, negative cavities looking like rectangular crystals, and needle-like shapes. If present in large numbers, the needle shaped inclusions can cause a cat's eye chatoyancy ...
If the threads in the gem all align themselves in a single direction, much like the strands in a spool of thread, the reflection will appear as a single ray of light called Chatoyancy, or Cat's-eye.
Sometimes displays plieochroism or chatoyancy. Tourmaline has a hardness of 7-7.5.
Troy Ounce
The unit of measurement used in apothecary and in precious metal markets.
 See also: Stone, Gemstone, Color, Eye, Crystal
  
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