Fissure
Fissure is a fracture of crack in a stone.
Flaw
Flaw is an imperfection on or in a gemstone. A flaw can be invisible to the naked eye, but can decrease the value of a gemstone.
Fissure: A fracture or crack in the surface of a stone.
Fleur-de-lys: From Old French "flor de lis": flor (flower) + de (of) + lis (lily). A stylized three-petaled iris flower, used as the armorial emblem of the kings of France.
Fissure A crack, gletz, feather, possibly reaching to the surface.
Flaw In inclusion or other feature which is visible or reduces clarity in diamonds or other gems.
Flawless Without any inclusions or features adversely affecting clarity.
Fissure A surface crack on a gemstone. Gems with fissures may be Fracture Filled.
Fissure - An elongated cavity in a diamond's surface. It may or may not have occurred along the line where a cleavage reached the surface.
Fissure - A fissure is a surface crack on a gemstone.
Fleur-de-lys - This royal insignia of France is an iris with three petals, and is often used as a decoration in jewelry.
Fissure - An elongated fracture or crack in the surface of a gemstone. Can also be found in cameos.
Florentine Finish - a crosshatched pattern which is tooled into the surface of a metal.
Fissure
A crack or fracture or feather, which possibly reached to the surface of a diamond.
Flat ...
fissure
A fissure is a crack in a rocks. A volcanic fissure is one from which lava erupts.
Fissures and fractures that are characteristic of emerald are traditionally filled with oil to minimize their visual impact. Cleaning emerald with an ultrasonic cleaner can remove or damage the oil, thus making the fissures more visible.
FISSURE
A fissure is an elongated fracture or crack in the surface of a diamond.
FLORENTINE FINISH ...
Fissures, or cracks, are common in emeralds. Try to avoid those that penetrate too deeply into the stone, thus making it more susceptible to splitting.
fissure filled
Fissure filling is a treatment that improves the apparent clarity of a gemstone by removing air and replacing it with a substance that has a refractive index similar to the host material.
Fissure: A crack in the surface of a stone.
Flapjack: A slim compact from the 1930s and 1940s.
Flaw: A crack, inclusion or other imperfection in a gemstone.
The fissures and inclusions that are characteristic of emerald are traditionally filled with oil to minimize their impact.
found in fissures, in Alpine crevices, contact metamorphic dolomites, and hydrothermal sulfide veins.
Association:
feldspar, calcite, dolomite, quartz, datolite, prehnite, pyrite ...
The fewer fissures, the more expensive the emerald. Cut natural emeralds of top quality weighing more than two carats are extremely rare and costly.
The minute fissures that are found in many emeralds lend themselves to a form of treatment by humans, aimed at diminishing or masking the inclusion's appearance ...
Feathers
A fissure in a precious stone or diamond, usually only a tiny crack. The feather may not affect the strength or beauty of the stone, but depending on the depth or location can make the gemstone more fragile and susceptible to cracking ...
lava Magma that comes to the Earth's surface through a volcano or fissure. leach To dissolve from a rock. For example, when acidic water passes through fractured rocks, soluble minerals leach, or dissolve, from the rocks.
" This calcium aluminum silicate develops in fissures of igneous rocks. It is actually a blue form of zoisite that was renamed tanzanite by the renowned jewelry store Tiffany & Co.
Veins are mineral deposits which form when a preexisting fracture or fissure within a host rock is filled with new mineral material. The deposition of minerals is typically performed by circulating aqueous solutions.
These are located inside fissures of rocks mostly as druzy clusters .They display a wide range of colors from bluish violet to brownish purple.
(1959) The origin of healing fissures in gemstones. Journal of Gemmology, Vol. 7, No. 2, April, pp. 40-66.
Gemmological Association of All Japan (2004) Lead-glass impregnated ruby.
Hänni, H.A. (1997-1998) Short notes on some gemstone treatments.
They found that clear oils and waxes rendered surface fissures less visible to the eye. Today, we have many sophisticated technologies with which to clarity-enhance emeralds.
However, you should look to make sure that fissures and inclusions do not go too deep into the stone so that it might be weakened enough to break if it were hit accidentally.
Whilst its good hardness protects the emerald to a large extent from scratches, its brittleness and its many fissures can make cutting, setting and cleaning rather difficult.
Tanzanite develops in fissures of igneous rocks as a secondary mineral through alteration of the minerals, where the surrounding rock is composed. It is also found in contact metamorphic zones of calcareous (calcium rich) schists and shales.
Fire opals are primarily found in hollow cavities and fissures in mountains of volcanic origin. The name is also due to the stone's intensive orange color, which gleams in nuances ranging from yellow to red.
Rapid changes in temperature can cause "thermal shock" in certain gemstones due to moisture content that is trapped within inclusions or fissures, as well as other structural and/or chemical features/defects that may be inherent in the gemstone.
Clarity: Small cracks, fissures and scratches are almost always present in even the most perfectly formed diamonds. These cracks and scratches are referred to as 'inclusions' or 'blemishes', and can detract from a diamond's beauty and value.
Clarity enhancement refers to the practice of filling the fissures that may be present in a diamond with a solid substance, such as a glass, that reacts to light in ways similar to diamond.
The Dead Sea is located in the Dead Sea Rift, which is part of a long fissure in the Earth's surface called the Great Rift Valley.
During heating, fluxes dissolve surface-reaching fissure walls and redeposit that dissolved gem material, healing the fissures closed. Example: Flux-healed ruby (particularly that from Möng Hsu, Burma) ...
Fracture filling is an impermanent process whereby small fissures of the stone are filled in with a translucent glasslike substance that is impossible to detect without a loupe. However, with a loupe it should be quite clear.
The heat produced when soldering the setting can cause fissures along cleavage planes and may lead to the gem actually breaking along these fissures (Schumann, 1997, p. 22).
A tiny fracture or fissure inside a diamond that often resembles a feather.
Because emeralds are seldom found without fissures and surface cracks, it's common for them to have been oiled, waxed or filled with resin. Because of the likelihood of those treatments, special care is called for when cleaning and handling emeralds.
Filling: The filling of surface breaking cavities or fissures with colorless glass, plastic, solidified borax or similar substances, which are visible under properly illuminated 10X magnification.
If opal is stored too dry or exposed to heat over a long period of time, it will show fissures and the colors will become paler.
A cleavage fracture or fissure with an irregular path inside the stone, usually breaks the surface of the stone.
Crown
The portion of the diamond above the girdle.
Inclusion
A naturally occurring flaw, (feather, fracture, fissure, carbon spot, or cloud), within a diamond or other stone. The test for clarity looks for these flaws.
Indian Agate
Indian agate is another term for moss agate.
Amber resin can ooze from trees and fill internal fissures trapping debris such as seeds, leaves, feathers and insects, which are buried and fossilized through a natural polymerization of the organic compounds.
flaw
An imperfection in a gemstone, including fissures, cracks, inclusions of other minerals and air or liquid filled cavities. Flaws usually reduce the value of a gemstone, except in some rare cases ...
while externally they may appear as scratches and fissures. Sometimes an inclusion does not affect a diamond's brilliance or gets easily hidden by its setting.
These solutions crystallize in fissures, cracks and cavities in various types of rocks.
MOSSY. Term applied to emeralds clouded by fissures.
MUDDY. Imperfect crystallisation which obstructs the passage of light; exemplified by mud stirred in water.
Oiling - A method used to seal a stone such as an opal from water loss. It is also used to fill fissures on the surface of emeralds, improving their clarity.
Organic Jewelry - Jewelry made from or produced by once-living organisms.
Flaw: Any external or internal imperfection on or in a polished diamond; feather, fissure, carbon spot, knot, natural, cleavage, chip, inclusions, etc. The term flaw and imperfection are usually used interchangeably.
Feather: A type of inclusion or flaw within a diamond. It is described often as a small crack or fissure.
Finish: Describes the exterior of the diamond. If a diamond is well polished, it has a very good finish.
CLARITY ENHANCED - A gemstone that has been treated to improve its appearance by filling fissures or fractures with a transparent substance. Also called "fracture filled." ...
An external mark or surface imperfection on a gemstone. For example, a nick, abrasion, knot, scratch, minor crack or fissure (cavity), or a poor polish. A natural or an extra facet is also considered a blemish.
Brilliance ...
Polymer and resin type fillers are also used to reduce the visibility of the fine fissures that reach the surface and therefor improve clarity.
Green agate is a form of agate which is a variety of quartz crystal and develops in the lining or filling of rock cavities and fissures, sometimes forming geodes.
Gold 9ct ...
In a process similar to oiling, an emerald's surface-reaching cracks and fissures are filled with epoxy resins. But while the oils tend to soften the effect of inclusions, epoxy properties are such that inclusions tend to be hidden.
BLEMISH - Any surface imperfection within or on a gemstone. For example, on a diamond, one would be referring to a nick, knot, scratch, abrasion, minor crack or fissure (cavity), or a poor polish.
Though it has the same chemical composition, or have the intriguing patterns of agate, moss agate is found in fissures or as pebbles rather than in a layered form.
Meaning of Agate ...
In Zabargad, nothing grows and there is no fresh water; it is scorching hot all year except for winter. In some locations, fissures are lined with gem crystals and beaches have a greenish hue due to tiny crystals.
If your stone has been waxed or oiled to smooth or fill thin scratches and fissures commonly found in natural emeralds, you may need to have the stone re-oiled or waxed professionally every few years.
Most Opal is 50-65 million years old, dating back to the time of dinosaurs in the Cretaceous period. Opal formed as silica from decomposing rocks that mixed with ground water and formed a silica gel that hardened in underground cavities and fissures.
 See also: Stone, Gemstone, Jewel, Color, Gemstones
  
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