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Alexandrite

Tsarstone collectors guide

alexandrite natural of photo stone

161.
An internationally acclaimed designer of fine jewelry. Recognized as the leading American jewelry designer, Yurman paved the way for a new era in fine jewelry with wearable, classic designs that carry a distinctive signature cable look. Available in over
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162.
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
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163.
Fameo Online Jewellery Boutique specialises in design and manufacture of the gold, colour gemstone and pearl jewellery. Award winning jewellery designs and bespoke jewellery service. Provides jewellery collections showcase, buyers tips and jewellery guid
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164. Alexandrite Questions, Answers and a Quick Reference
The quick reference to how to select, buy and enjoy alexandrite gemstones and jewelry
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165. Javore
Javore is an alexandrite jewellery designer.
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166. Multicolour Gems
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167. Red color change garnet at Alexandrite discussion forums | Alexandrite guide
Red color change garnet at Alexandrite discussion forums | Alexandrite guide
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168. Accessibility of Alexandrite Tsarstone Collectors Guide
Alexandrite Guide website accessibility standards are in place with the intention of making the content accessible to the widest range of visitors, regardless of disability or impairment.
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169. Zimbabwean alexandrite, Girdlestone Farm
Information about Zimbabwean alexandrite findings and mining in Girdlestone Farm, Zimbabwe.
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170. American alexandrite, La Madera Mountain Mine
Information about American alexandrite findings and mining in New Mexico, USA.
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171. Tanzanian alexandrite, Lake Manyara
Information about Tanzanian alexandrite findings and mining in Lake Manyara, Tanzania.
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172. Tanzanian alexandrite, Tunduru
Information about Tanzanian alexandrite findings and mining in Tunduru, Tanzania.
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173. Ceylon alexandrite, Horana
Information about Ceylon alexandrite findings and mining in Horana, Sri Lanka.
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174. Ceylon alexandrite, Balangoda
Information about Ceylon alexandrite findings and mining in Balangoda, Sri Lanka.
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175. Russian Alexandrite, Malyshevskoye
Information about Russian alexandrite findings and mining in Malyshevskoye, Russia.
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176. Russian Alexandrite, Izumrudnye Kopi
Information about Russian alexandrite findings and mining in Izumrudnye Kopi, Russia.
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177. Burmese alexandrite, Mogok
Information about Tanzanian alexandrite findings and mining in Tunduru, Tanzania.
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178. Madagascar alexandrite, Ilakaka
Information about Madagascar alexandrite findings and mining in Ilakaka, Madagascar.
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179. Indian alexandrite, Deobhog
Information about Indian alexandrite findings and mining in Deobhog, India.
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180. Brazilian alexandrite, Teafilo Otoni
Information about Brazilian alexandrite findings and mining in Novo Cruzeiro, Brazil.
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181. Brazilian alexandrite, Itaitinga Mine
Information about Brazilian alexandrite findings and mining in Itabira, Brazil.
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182. Brazilian alexandrite, Hematita
Information about Brazilian alexandrite findings and mining in Hematita, Brazil.
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183. Brazilian alexandrite, Novo Cruzeiro
Information about Brazilian alexandite findings and mining in Novo Cruzeiro, Brazil.
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184. Brazilian alexandrite, Esmeraldas de Ferros
Information about Brazilian alexandrite findings and mining in Esmeraldas de Ferros, Brazil.
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185. Brazilian alexandrite, Serra Dourada
Information about Brazilian alexandrite findings and mining in Serra Dourada, Brazil.
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186. Brazilian alexandrite, Caraiba mine
Information about Brazilian alexandrite findings and mining in Pindobacu, Brazil.
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187. Brazilian alexandrite, Carnaiba Mine
Information about Brazilian alexandrite findings and mining in Pindobacu, Brazil
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188. Australian alexandrite, Dowerin
Information about Australian alexandrite findings and mining in Dowerin, Australia.
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189. Alexandrite World Occurrences and Mining Localities
Directory of confirmed findings and current mining localities of alexandrite, cat´s eye and chrysoberyl gemstones
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190. How can I check the color change in an alexandrite
Two kinds of light are required to observe color change; daylight and incandescent light?
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191. What do I need to check before purchasing alexandrite gemstone?
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
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192. Where can I test and appraise my alexandrite?
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.
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193. Is the June birthstone pearl or alexandrite?
Various birthstone lists have been used in different cultures for thousands of years.
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194. Where can I buy natural alexandrite gemstones?
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
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195. What is the best way to clean and take care of alexandrites?
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
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196. Where do the best alexandrite gemstones come from?
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
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197. I have an alexandrite ring that my parents purchased in the 50s, what are the chances the stone is a genuine natural alexandrite?
It is very unlikely that even an old alexandrite ring could contain a natural alexandrite. Natural alexandrites, especially large clean stones are extremely rare and almost never available at any price. Most old inherited alexandrite rings are actually sy
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198. How can I spot the difference between a natural and a synthetic alexandrite?
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199. Are there any ways to improve alexandrite colors by any special treatment like heating?
Alexandrite cannot be improved by any kind of thermal treatment. Although some have tried, heat treatment does not seem to affect alexandrite at all. Some lower quality cracked alexandrites are oiled to hide the cracks but beyond that, alexandrite is not
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200. Why is natural alexandrite better than synthetic alexandrite?
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
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201. Is alexandrite the most expensive gemstone in the world?
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
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202. How much will a typical one carat alexandrite gemstone cost?
The retail replacement cost for a 1ct. alexandrite could be anywhere between $500 to $12,000 per carat. The intensity of the color change and the attractiveness of the colors are the most important factors in determining the value of an alexandrite. With
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203. What are the most common colors of alexandrite?
Unfortunately, most alexandrites show either a nice color in daylight or an attractive color under incandescent light. Rarely are both colors bright and vivid and often stones that change to bright red under incandescent light are only brown or almost bla
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204. Why does alexandrite appear to change color in sunlight and artificial light?
Alexandrite is a trichroic gemstone which absorbs and reflects light differently in each of its three optical directions. Spectroscopic analysis reveals a different absorption spectrum for each of the three optical directions. The differences in absorptio
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205. Are there any other gemstones which change color?
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.
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206. What causes the cat's-eye effect in chrysoberyl?
The cat's-eye effect is caused by the reflection of light off of minute, parallel, needle-like rutile crystals or hollow tubes within the stone. Cat's eye inclusions are aligned parallel to the crystallographic axis and the stones are always cut as caboch
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207. What is the difference between cat's eye and alexandrite?
Cat's eye is the popular name for an optical effect known as chatoyancy in the gemological nomenclature. Microscopic needle-like inclusions inside the stone reflect a streak of light that appears to open and close as the stone is rotated -- hence the eye
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208. What is the difference between chrysoberyl and alexandrite?
Chrysoberyl is the species name and Alexandrite is the variety name. Alexandrite is that variety of chrysoberyl that changes color as a function of the light source; green in daylight and red under incandescent light.
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209. What makes natural alexandrite so expensive?
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
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210. Is there a difference between Russian and Brazilian Alexandrite gemstones?
The mining of alexandrite in Russia lasted less than 100 years from the time it was discovered in 1833 to the early 1900’s. It was George Kunz, the gemologist/gemstone buyer for Tiffany & Co that probably did the most to popularize this unique gemst
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211. A Bibliography of Alexandrite Gemstone Buyer and Collector's Guide
An annotated bibliography of Alexandrite Gemstone Buyer and Collector's Guide
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212. Zoning
The straight, parallel growth-lines in the internal structure of a gemstone with definite angles, usually seen in some stones, which occur by slightly variation in the chemical composition within the crystal due to separation or interruptions of the cryst
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213. Zone of crystal faces
In crystallography a characteristic feature of a serie faces of a crystal where those intersection lines with each other are all parallel.
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214. Zone axis
A line runs through the center of a crystal, to which all faces of a given zone are parallel.
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215. Zone
A group of crystal faced intersection, which are parallel to a common line.
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216. Zonary growth
Zonary growing of crystals bounded by plane crystal faces, which occur by slight variation in the composition of a crystal due to separation or interruptions of the crystal phases during growth.
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217. Yttrium
A dark gray, silvery luster, rare earth metallic element of the Periodic System with the symbol Y. Flammable when powder from. Used in alloys and as a metal deoxidizer.
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218. Young-Helmholtz theory of color vision
The theory that the eye contains three different groups of retinal fibers (cones) with maximum response to three primary colors to red-yellow, green, and blue violet, which are parts of the spectrum.
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219. Yellow chrysoberyl
Yellow greenish to light yellow or brown chrysoberyl, which contains ferric iron as an impurity. Has an absorption spectrum band at first part of the violet at 444 nm, which can be seen in some chrysoberyl cat's-eye.
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220. Yehuda treatment
A colorless glass-like material used as an impregnation or filling agent to improve the appearance and reduce the visibility of inclusions in stones such as diamonds and emeralds.
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221. Y-axis
One of the 3 optic axes and intermediate axis in biaxial crystal.
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222. X-ray spectrum
Several characteristic lines of the spectrum of X-ray, which are emitted by a bombardment of material with electrons such as curved dark lines on the films produced by X-ray method of powder diffraction of stone or minerals.
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223. X-ray fluorescence
If a crystal is irradiated by an intense X-ray or gamma-ray beam, this includes the substance to emit its visible characteristic secondary X-ray line spectra of a longer wavelength, which is known as X-ray fluorescence. It is a nondestructive method. Used
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224. X-ray filters
To generate monochromatic X-rays or line spectrums only one wavelength used is a suitable selective filter made of very thin layers of metal elements. There have one or two atomic numbers lower than the target metal such as nickel with atomic number 28 us
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225. X-ray crystal spectrometer
A device to obtain an X-ray spectrum for determining the wavelength of its chemical consistent. Each element, when irradiated by electrons, emits X-ray of several characteristic frequencies the line spectrum depending on the atomic number.
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226. X-ray
The produced wavelengths of X-rays according to the electromagnetic theory of light consisting of continuous band of wavelengths, which are a mixture of all wavelengths. Depends on the used voltage of apparatus, which is know as white X-ray radiation or g
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227. Weight of gemstones and precious metals
A standard mass. The unit of weight of gemstones since 1913, is the international metric carat or decimally of them in points.
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228. Weathering
A natural geological description for disintegration and decomposition of rocks and minerals as consequent exposure to atmospheric agents at or near the Earth's surface such as chemical action of air, rainwater, frost, insolation, bacteria, plants, and mec
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229. Wavelength
The distance between two points having the same phase on the following or preceding wave. The wavelength of electromagnetic radiation is equal to the velocity of the wave divided by its frequency =c/v. It is measured in nanometers unit.
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230. Wave form of light
The pictorial graphical representation of the shape of a wave obtained by plotting the values of the periodic quantity against the time.
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231. Water of crystallization
Water molecules, which have been chemically combined in certain crystals or hydrated salts, which are given off when the crystals are heated.
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232. Volcanic rock
Generally a fine crystalline or glassy igneous rock, which is formed by the solidification of molten magma or lava on the Earth's surface during volcanic action. Such as basalt, obsidian, etc.
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233. Volcanic glass
A solid volcanic natural form of glass (rock) produced by sudden cooling and solidification of viscous lava before crystallization can take place, such as obsidian, pitchstone or other glassy masses. Obsidian is used for tumbled gems, ornamental objects,
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234. Vanadium
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
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235. Vacuum fluorescence display
A miniature cathode ray tube (CRT), which is closet to cover glass and heated cathode made of tungsten wire emits electrons. The electrons are accelerated by positively charged by hexagonal steel and passing through the grid to anodes covered with blue fl
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236. Ultraviolet microscope
A special magnifying device for investigating the objects are illuminated by ultraviolet light in the range 180 to 400 nm. The resolving power is increased corresponding to the resolution of shorter wavelengths than visible light. It requires special quar
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237. Ultraviolet lamp
A mercury discharched lamp in quartz glass designed to produce ultraviolet light for exciting luminescence in gem minerals specially diamonds. The long-wave lamp is provided with wood's glass filter to emit wavelengths between 400 nm and 300 nm. To obtain
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238. Ultrasonic cleaning
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
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239. Ultramafic
A type of igneous rock characterized by a high content of mafic minerals, particularly olivine, pyroxenes, amphiboles, etc. The silica content is less than 45%.
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240. Transparent
A gemstone permits the pass of electromagnetic radiation through it without distortion so that the object can be seen clearly and distinctive through it, such a quartz crystal. It is a see through effects.
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