Alexandrite gemstone buyer and jewelry collector guide holds information on history, lore, value and properties of the chrysoberyl varieties, including alexandrite and cymophane gemstones.
David Wein is an online fine jewelry store in association with Multicolour.com, the world´s most eclectic favourite online gemstone retailer.
David Wein brings together an exquisite range of fine jewelry at exceptional value. Visitors will find an e
First professional gemological laboratory to be established in Asia in 19978, - The AIGS Gemological Laboratory is a private, independent gemological laboratory, member of the Thai Gem and Jewelry Traders Association (TGJTA), and The International Colored
Named after Russian Tsar Alexander II. A highly dichroic, rare variety of chrysoberyl. Emerald green in natural daylight, reddish in violet by artificial light, due to its unusual absorption properties. One of the hardest and most important gemstones. A f
Alexandrite gemstone buyer and jewelry collector guide holds information on history, lore, value and properties of the chrysoberyl varieties, including alexandrite and cymophane gemstones.
American Gemological Laboratories is a unit of Collectors Universe, the leading provider of value-added authentication and grading services for high-value collectibles and gemstones, which was founded in 1986 and publicly traded since 1999. In 1977, Ameri
Several other well known gemstones, including diaspore, sapphire, garnet and spinel may also change color as a function of the light source but the color change of top alexandrites is distinctive and attractive under any light conditions.
A unit employed in weighing diamonds, pearls, and other gemstones, which formerly ranged from 185.5 to 205.3 milligrams. Now the International metric carat is equal to 0.2 gram, or 200 milligrams and this is the standard in a majority of countries. Abbrev
An optical effect, possessed by certain translucent gemstones in reflecting light, in which a movable, wavy or silky sheen is concentrated in a narrow band of white light that changes its position, when the gem is turned. This is a characterized of cat's
The classification of fashioned gemstones or diamonds according to their clarity using the standard nomenclature of terms: flawless, pure, clean, perfect (for top grade). VVS (very very slightly included), VS (very slightly included), SI (slightly include
There are four major methods of changing the colors of gemstones. These are surface painting or foiling the back, oiling, coating, impregnating, staining of porous stones, heat treatment, and irradiation by particles of atomic size and X-rays. The color c
Colored Stone is owned by Interweave Press. Included among its magazines are Beadwork, Knits, American Artist, and FiberArts. In business since 1975, Interweave Press publishes a growing number of magazines and many books related to fiber, thread, needlew
David Wein is an online fine jewelry store in association with Multicolour.com, the world´s most eclectic favourite online gemstone retailer.
David Wein brings together an exquisite range of fine jewelry at exceptional value. Visitors will find an e
This is a technique used to make certain synthetic gemstones such as emerald, ruby, spinel, quartz, Alexandrite, YAG, etc., man-made crystals growing in a high melting solvent or flux. The material or composition of desired synthetic crystal (beryllium an
GAA was formed in Sydney, on the 29th October 1945, the Association has been responsible for producing Australia’s gemmologists by educating and updating members of the gem and jewellery industry and the general public, about all aspects of gemstones an
Any rough mineral or other material natural or synthetic, which possesses the necessary attractiveness, brilliance, beauty, rarity, color dispersion, refraction, color or colorless, flawless, portability, fashionably, and durability for use in gem industr
Dr. Eduard J. Gubelin, one of the forefathers of modern gemology, and who was a Founding Organizing Member as well as an Honorary Member of the International Colored Gemstone Association (ICA), passed away in Lucerne, Switzerland in March at the age of 91
The quality of resistance or property of minerals, gemstones, etc., which is determined by reference to an empirical scale of standard of minerals. Hardness is the resistance of a mineral offered to abrasion or scratching (scelerometric). The absolute har
Established in 1987, Hong Kong Gems Laboratory is well equipped and recognized by gemologists and industry professionals. Full-service lab offers FTIR spectrophotometerservice, which provides evidence for jadeite jade and diamond, corundum, emerald and ot
To result something of a genuine article or natural gemstone or simulate it from any material that imitate by its color, the appearance of a natural gemstone. Imitation gemstone having wholly different physical properties and chemical composition, and hen
Along with diamonds, rubies, and emeralds, top quality alexandrites are among the most expensive gemstones in the world. In larger sizes over 4.00 or 5.00cts., Burmese rubies are more rare and expensive than alexandrites but in sizes below 1.00cts., alexa
A craftsman who cuts, polishes, and engraves colored gemstones, other than diamonds. A worker who cuts, and polishes diamonds is known as a diamond cutter.
The emission of certain visible wavelengths of light from a substance other than thermal process, which are used as diagnostic determination of gemstones. It is caused by the emission of photons, when an exited atom within the substance returns to the gro
A light-colored, coarse-grained igneous rock from granite clan containing orthoclase, quartz, microline, mica, gemstones, and many ferromagnesian minerals resulting from slow solidification. Pegmatite is occurring place of many uncommon gem minerals such
A special optical occurrence, or circumstance observed or are visible in certain gemstones such as chatoyancy, asterism, or play of color, adularescence, girasol, labradorescence, opalescence, schiller, etc.
Physical properties of gemstones are extremely important in understanding geological phenomena in synthesizing new materials, and identification of minerals. Physical properties and chemical composition of minerals change with temperature and pressure. P
A small hand optical device for obtaining and visually observing spectrum, in which collimated light passes through a narrow slit onto either a prism or diffraction grating, its spectrum being viewed by a lens system or telescope. The angle between the c
Any array of electromagnetic visible light ordered according to its constituent wavelengths or colors, when the white light is dispersed by a prism or diffraction grating, ranging from about 750 to about 400 nm. The spectra can obtained by means of spectr
SSEF laboratory offers analysis of precious stones and issue test reports for diamonds, coloured stones and pearls. It was recognized in 1978 by the International Confederation of Jewellers and Goldsmiths (CIBJO and also a member of the International Colo
Artificially made substance that has the same appearance, physical properties and chemical compound as its natural counterpart mineral. Some synthetic stones have no counterpart in nature they are synthetic gemstones except if they used as an imitation fo
IT Gem Testing Laboratory (GIT-GTL), has been accredited by The World Jewellery Confederation (CIBJO) as the CIBJO Registered Laboratory since May 2000.
The museum features four main galleries: The Weinman Mineral Gallery, The Fossil Gallery, Science in Motion and The Collins Family My Big Backyard. A 120-seat digital planetarium and an observatory with a state-of-the-art 20-inch telescope will also be lo
Gemstone transmits light but no object can be seen clearly through it such as moonstone. Translucent gemstones are not suitable for brilliant cutting but cut cabochon.
A device for cleaning dirt and other foreign particles from gemstones and jewelry articles by subjecting them to ultrasonic vibrations immersed in water or other solvent. The articles must be free of stress flaws. Glass lenses and other bodies can be poli
A very hard, light-gray, ductile, malleable, metallic element of the group V of the Periodic System with the symbol V. It is one of the 8 pigment metals responsible for color in gemstones such as beryl, sapphire (natural or synthetic). Used as a component
First and foremost, we need to look at the quality and strength of the color change. A strong change where the colors are bright and attractive under any kind of light is most desirable. Many stones are either a beautiful green in daylight or a nice pinki
With a hardness of 8.5, Alexandrite is a tough, hard, and durable gemstone that doesn't require any special attention. Still, even the hardest gemstones can shatter with a single well-placed blow so caution is always a good idea. Washing dishes with your
Alexandrite is an expensive gemstone because it so rare and production has always been limited. For years, the only source for alexandrite was Russia. In the last 20 or 30 years several new discoveries of alexandrite have been reported but production of s
Fine alexandrites or alexandrite jewelry can be purchased from jewelers specializing in colored gemstones, at trade shows, from TV sellers, at high end jewelry auctions, or online from websites specialized in alexandrite. You would be unlikely to find a h
The most well known gemological laboratories are listed below and all of them are equipped to test alexandrite. Most gemological laboratories only identify gemstones, they do not appraise them.
Although Russian alexandrites have the most historical value, fine stones are occasionally available from deposits in Brazil, India, Tanzania, Madagascar, and Sri Lanka. Unfortunately, there has been little production of alexandrites from any deposit in r
Natural alexandrite is not better than synthetic alexandrite but natural alexandrite is very rare and uncommon in modern jewelry because it is hardly ever available and because it is too expensive for the general public to buy. Even lower quality more inc