Phenomena! Certain, special gemstones have the unique ability to display a majestic star pattern, the intriguing feline like Cat's-eye, the almost hypnotic billowing sheen of moonstone, ...
Phenomenal obsidian: Most obsidian is pretty plain looking, in mostly drab shades of brown and black. Certain types, however, display iridescent patterns due to dense congregations of minute suspended inclusions that act like diffraction gratings.
Asterism, chatoyancy, play-of-color, opalescence, labradorscene, adularescence and color change are some special optic phenomena which have been seen in gems.
Asterism ...
phenomenal stone A stone that exhibits a phenomenal effect, such as a star, cat's-eye, or adularescence.
pick A selection from a parcel of gemstones.
pink To heat topaz at a low temperature to turn the hue to pink.
Phenomena: Special properties exhibited by certain gemstones. An excellent example of a phenomenon is the color-change property of the alexandrite.
Phenomenal Gems Gems that display unusual optical properties such as color change, chatoyancy, asterism or iridescence.
Phenomena sometimes observed in quartz include asterism (star effect) and chatoyancy (cat’s eye effect).
Amethyst is the queen of the quartz varieties and in better qualities it is among the most coveted of quartzes.
Phenomenal Variety of Designs. From classic to elegant, you will find earrings suited for every occasion and every skill level. Features over 40 earring designs from simple to complex, all complete with full-color, step-by-step directions.
Phenomena
Pyrope-spessartite mixed garnets containing vanadium have been found that display a dramatic green (daylight) to red (incandescent light) change of color. Such stones come from East Africa and Sri Lanka.
Handling ...
phenomenal gemstones
Gems that display unusual optical properties such as color change, stars (asterism), cat's-eyes (chatoyancy), adularescence, etc. are known as phenomenal gemstones.
pigeon's blood red ...
Non-phenomenal chrysoberyl is transparent to semi-transparent, comprising a range of colours.
As if one phenomena wasn't enough, some Zultanite also possess the coveted cat's eye effect. 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.
Color range/ phenomena
Near colorless to a deep red, often slightly purplish, strongly fluorescent. Violet stones are seen on occasion.
Geologic formation ...
List of geological phenomena
List of important publications in geology
List of spits (landforms)
Wikipedia:WikiProject Geology ...
The study of such phenomena as indicators of the Earth's magnetic history. paleontology The science and study of previous life forms, primarily in the form of fossils. paleontologist Individual practicing in the subject of paleontology.
Gem Phenomena (8 members)
Gemological Literature (96 members)
Gemology (237 members)
Gemstone Cuts (35 members)
Gemstone cuts (1 member)
Gemstone images (337 members)
Gemstones (124 members)
General History Literature (2 members) ...
The current popularity of blue topaz is a direct result of its phenomenally low cost compared to other blue stones (aquamarine, sapphire) which, in turn, ...
The intense blues, vivid colors and rare phenomena associated with this gemstone have kept Sapphire among the most sought after gems in the world for centuries.
Very rational people are suspicious of intuition, psychic phenomena, and sometimes strong emotions, because they can't be explained through a scientific, cause-and-effect approach.
Asterism: An optical effect sometimes seen in phenomenal gemstones like star sapphires. A six-ray star should be visible over the dome of a cabochon-cut gemstone when minute needle-inclusions are arranged just so.
Comprehensive and organized for easy access, this phenomenal reference provides the current value for thousands of books, from the old and rare to more modern volumes.
because they provide a nondestructive means for identifying gemstones and are responsible for all the features one immediately observes and admires including color, luster, brilliance, scintillation, and dispersion, as well as special phenomena, ...
Some gemstones exhibit extraordinary optical effects known as phenomena. These rare and beautiful effects very often add value to gemstones.
FLUORESCENCE. The phenomenal quality exhibited by some gems of showing one colour in transmitted light and another in reflected light; fluorite, from which the word is derived, is a striking example.
Don't be misled into believing that treatments are new fangled gemstone industry phenomena. Texts dating back to 12century A.D. report gemstone treatments. If it were not for these, we wouldn't be able to recognize sapphires as we know them as.
Orogenesis...A complex phenomena that leads to the formation of mountain ranges.
Outcrop...Where the bed rock is exposed.
Paleontology... a division of geology that concerns itself with prehistoric life.
Not everyone will experience the phenomenal success of Mr. Hancock. However, if you read the following article, your chances of success will rise geometrically.
Description under REMARKS: "Twinning lines" "Growth lines" "Growth phenomena"
The structural defects can diminish the clarity grade (The lower the clarity grade, the smaller the influence) .
Easily discemible with a 10.x loupe ...
Gems that show special optical effects are known as phenomenal stones. Chrysoberyl dominates this category, because not only is alexandrite the most spectacular color changing gem, cat's-eye chrysoberyl has the most dramatic eye.
Heating: The use of heat to affect desired alteration of color, and/or phenomena. (Residue of foreign substances in open fissures is not visible under properly illuminated 10X magnification.)
HP ...
Drusy: A gemstone with natural surface textured similar to fine sugar crystals. Drusy is created by the phenomena of micro-crystalline facets forming on a gem and the surrounding rock, they were formed naturally millions of years ago.
In gemology, a division of a species, based on color, optical phenomena or other distinguishing characteristics of appearance
Vermeil
Silver that has been gilded ...
Needle-like inclusions (or foreign matter) within a stone, which can produce some gem phenomena as an asterism (star) and a cat's eye, depending on the direction of the rutiles.
Scarab ...
Because of the various phenomenal properties associated with colored gemstones, gemstone rings can be especially meaningful to their wearer.
FOILBACK - Any gem material that has an applied metallic backing to improve color, brilliance and/or phenomena such as a glass, rhinestone-accent stone, or other material.
Considering that 150 years has passed since this locality was first collected, it is surprising to still to find collectible specimens. Though the quality will never match the phenomenal calcites first collected during construction, ...
It is an aluminate of beryllium- a mixture of aluminum and beryllium having traces of oxide of iron and chromium. This is one of many stones that exhibit a phenomena effect involving a reflected line down the center of the stone when viewed in ...
The term "enhancement" is defined to be any treatment process other than cutting and polishing that improves the appearance (color/clarity/phenomena), durability, or availability of a gemstone.
Composition:
Composed of iron and oxygen (FE2O3).
Chrysoberyl is an action gem, changing and moving in response to light. In the gem world, special effects are known as phenomena. The gem varieties of chrysoberyl respond to light in surprising ways.
Additionally, there are feldspars that have general names because of unique optical phenomena; these are sunstones and moonstones. Fine, gem-quality feldspar is very rare and some species and varieties are more common as gems than others.
The rutile needles can be reddish (which is what rutile means in Latin). Often found embedded in quartz; can also produce some amazing gem phenomena as a star and a cat's eye in sapphire and other gems.
collections of gem photographs along with information needed to show the customer what a stone is, interesting facts about particular species and advice on cleaning. It covers how to evaluate cuts, styles, color and inclusions. Treatments, phenomenal ...
Authors Snelling and Rae tapped into this phenomena and brought this digital idea to a hardcopy publication.
However, at least two thirds of the surface area of the earth is covered by a thin layer of this type of rock. The processes by which sedimentary rocks are formed are surface phenomena driven by surface waters and weather.
Although normal modes are wave-like phenomena in classical mechanics, they acquire certain particle-like properties when the lattice is analysed using quantum mechanics (see wave-particle duality.) They are then known as phonons.
 See also: Stone, Color, Crystal, Gemstone, Jewel
  
|
RSS
