Amethyst Gem Stone
August 12, 2010 
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 A24 Approx 15 carats gem stone Amethyst oval cut stone natural rock gems $8.99 --> Ends In 2h 47m <-- |  A72 080 carat loose gemstone gem stone Amethyst pear cut stone natural rock $2.99 --> Ends In 3h 6m <-- |  A71 040 carat loose gemstone gem stone Amethyst pear cut stone natural rock $2.99 --> Ends In 3h 34m <-- |
 10mm Round Briliant Grape Amethyst Gem Stone Gemstone $15.95 Buy It Now --> Ends In 3h 36m <-- |  A4 Approx 3 4 carats gem stone Amethyst round cut stone natural rock gemstones $2.99 --> Ends In 3h 36m <-- |  A21 Approx 040 carats gem stone Amethyst oval cut stone natural rock gems $2.99 --> Ends In 3h 47m <-- |
 A13 1 carat loose gemstone gem stone Amethyst Princess cut stone natural rock $2.99 --> Ends In 4h 8m <-- |  loose gemstone tanzanite amethyst quartz vintage $399.99 Buy It Now --> Ends In 4h 46m <-- |  Royal Purple 7x5mm Oval Amethyst Loose Gemstone Set Jewelry Television $13.99 Buy It Now --> Ends In 4h 52m <-- |
 2059 Carat Oval Rose Amethyst Gem Stone Gemstone $73.99 Buy It Now --> Ends In 5h 32m <-- |  1590 Carat Oval Rose Amethyst Gem Stone Gemstone $56.99 Buy It Now --> Ends In 5h 40m <-- |  811 Carat 14x12 Oval Amethyst Gem Stone Gemstone $28.99 Buy It Now --> Ends In 5h 53m <-- |
 676 Carat Pear Brazilian Amethyst Gem Stone Gemstone $23.99 Buy It Now --> Ends In 6h 6m <-- |  Cabochon Gemstone Amethyst Light Purple 8x10mm Pk 3 $2.63 Buy It Now --> Ends In 6h 6m <-- |  18338 Carat Oval Large Amethyst Cabochon Gem Stone Gemstone $39.99 Buy It Now --> Ends In 6h 24m <-- |
 Carved Amethyst Quartz Rose Carving Gem Stone Gemstone $19.99 Buy It Now --> Ends In 6h 34m <-- |  Cabochon Gemstone Amethyst Med Purple 8x10 Oval Pk 3 $4.50 Buy It Now --> Ends In 7h 26m <-- |  GA5 Approx 046 carats Oval cut Green Amethyst loose gemstone natural $6.21 --> Ends In 7h 30m <-- |
 FANCY OVAL SHAPE 520 Carats 14 x 10 mm GREEN AMETHYST LOOSE GEMSTONE $7.02 --> Ends In 7h 39m <-- |  470 carat 11 x 11 mm CUSHION CUT GREEN COLOR LOOSE AMETHYST GEMSTONE $6.35 --> Ends In 8h 4m <-- |  245 ct 9 mm ROUND BRILLIANT LOOSE AMETHYST GREEN COLOR GEMSTONE $3.31 --> Ends In 8h 29m <-- |
 125 ctw 8 x 6 mm EMERALD CUSHION GREEN CHECKER BOARD AMETHYST GEMSTONE $1.69 --> Ends In 8h 54m <-- |  592 Carat 8 8x5 Amethyst Pear Gem Stone Gemstone $13.99 Buy It Now --> Ends In 8h 57m <-- |  472 Carat 13x10 Oval Amethyst Gem Stone Gemstone $10.99 Buy It Now --> Ends In 9h 13m <-- |
 9 Carat 14 x 14 mm FANCY PRINCESS CUT DELIGHTFUL GREEN COLOR AMETHYST GEMSTONE $12.15 --> Ends In 9h 19m <-- |  575 Carat Pair Marquise Amethyst Gem Gemstone Gem $22.99 Buy It Now --> Ends In 9h 55m <-- |  225 ctw SI HIGH CLARITY 10 x 8 mm OVAL CUT GREEN LOOSE AMETHYST GEMSTONE $3.04 --> Ends In 10h 9m <-- |
 GA8 Pear cut Green Amethyst loose gemstone natural approx 038 carats $9.50 --> Ends In 10h 30m <-- |  SUPERB 100 ct GREEN AMETHYST 8x6 mm OVAL DOUBLE CHECKER LOOSE GEMSTONE $0.76 --> Ends In 10h 34m <-- |  544 Carat Amethyst Emerald Cut Gem Stone Gemstone $12.99 Buy It Now --> Ends In 10h 35m <-- |
 15 carats Heart Purple AMETHYST 8mm Loose Natural Gemstone $0.99 --> Ends In 11h 18m <-- |  Beautiful Amethyst Gemstone $12.99 --> Ends In 11h 25m <-- |  Beautiful Amethyst Gemstone $12.99 --> Ends In 11h 29m <-- |
 2819Carat Oval Rose Amethyst Gem Stone Gemstone $99.99 Buy It Now --> Ends In 11h 59m <-- |  A11 Approx 1 3 carats loose gem stone Amethyst Princess cut stone natural rock $2.99 --> Ends In 12h 48m <-- |  A61 Approx 1 4 carats gem stone Amethyst Baguette cut stone natural rock gems $2.99 --> Ends In 12h 48m <-- |
 GEM STONES 250 CTW ROUND CUT GENUINE AMETHYST $2.00 --> Ends In 13h 12m <-- |  200 Carat 8 x 8 mm FANCY CUSHION SHAPE GREEN AMETHYST LOOSE GEMSTONE SI CLARITY $2.70 --> Ends In 13h 53m <-- |  3503 Ct Trillion Amethyst Gem Stone Gemstone Natural $124.99 Buy It Now --> Ends In 13h 55m <-- |
 Pair HEART Gemstone Faceted Ready to Set Garnet Peridot Topaz Amethyst $5.99 Buy It Now --> Ends In 14h 8m <-- |  4420 Ct Marquise Amethyst Gem Stone Gemstone Natural $156.99 Buy It Now --> Ends In 14h 18m <-- |  HOARDERS GEMSTONE Wholesale LOT 5pc 43+ct total RubyCitrineAmethystmore $2.25 --> Ends In 14h 43m <-- |
 Oval Marquise Cut 4 Carat Loose Amethyst Gemstone $9.75 --> Ends In 14h 54m <-- |  10 carat Pear Purple AMETHYST 9x6mm Loose Natural Gemstone $0.99 --> Ends In 15h 51m <-- |  105 carats Oval Green AMETHYST 78x6mm Loose Natural Gemstone $9.99 --> Ends In 15h 51m <-- |
 Oval Cut Amethyst Loose Gemstone 59 x 77 mm $5.00 Buy It Now --> Ends In 16h 33m <-- |  4804 Ct Oval Rose Amethyst Gem Stone Gemstone Natural $170.99 Buy It Now --> Ends In 16h 33m <-- |  4756 Carat Oval Amethyst Gem Stone Gemstone Natural $168.99 Buy It Now --> Ends In 16h 36m <-- |
 LARGE Beautiful Amethyst BIG GEM STONE ring pendant Clarity IF Q4JJJDF $24.99 --> Ends In 17h 34m <-- |  A LARGE Beautiful Amethyst A BIG GEM STONE for a ring or pendant 774WQ $24.99 --> Ends In 18h 2m <-- |
Laboratory-created stones, or synthetic gemstones, as the name implies, are made in a laboratory. Synthetic gemstones do not have the rarity of naturally colored stones and they are less expensive than naturally mined stones. Because of the way they are made, synthetic gems may show subtle differences in shape and colour that help to distinguish them from their natural counterparts. A synthetic gemstone is identical to a natural gemstone in almost every way. This includes the same basic crystal structure, refractive index, specific gravity, chemical composition, colors, and other characteristics.
Since the same gemological tests are used for stone identification on both natural and synthetic gems, it is sometimes even possible for a gemologist to be puzzled as to whether or not a stone is natural or synthetic. Such stones can be made colourless, or, by the use of metallic oxides, in many colours, and thus can be made to resemble many natural stones, including the Amethyst, diamond, spinel, emerald, Opal and corundum (ruby and sapphire). Alexandrite.
Lapis lazuli, turquoise, and coral produced by the French manufacturer, Gilson, are similar to their natural counterparts, but are not true synthetics because their optical and physical properties differ from the natural gems. Gilson lapis lazuli, for example, is more porous and has a lower specific gravity.
Methods of making Synthetic gemstones
Growth from Melt:
* The Flame Fusion or Verneuil Process
Originally developed (1902) by a French chemist, Auguste Verneuil, the process produces a boule (a mass of alumina with the same physical and chemical characteristics as corundum) from finely ground alumina (Al2O3) by means of an inverted oxyhydrogen torch that opens into a ceramic muffle. With slight modifications, this method is used to produce spinel, rutile, and strontium titanate.
In Verneuil method for making rubies, a rod with a "seed crystal" is lowered into melted minerals and then brought back up. Repeating this process over and over grows a large crystal on the end of a rod from the melted minerals. The ruby can then be detached and cut and polished.
* Pulling or Czochralski's Technique
A method of growing synthetic crystal by high-melting point devised by Polish scientist Jan Czochralski, who discovered the method in 1916 while investigating the crystallization rates of metals. Czochralski and is named as Czochralski pulling technique. Where a seed crystal is gently lowered until it is in contrast with pure melt in the crucible and it is then pulled slowly upwards. The product shows rod-like single crystals. Used to make rare-earth garnets, lithium niobate, synthetic scheelite, and synthetic alexandrite.
* Brigman-Stockbarger Technique
The method involves heating polycrystalline material in a container above its melting point and slowly cooling it from one end where a seed crystal is located. Single crystal material is progressively formed along the length of the container. The process can be carried out in a horizontal or vertical geometry.
Growth from Solution:
* Hydrothermal Method
Aquamarine and Quartz crystals are grown in a solution in autoclaves, where temperature and pressure are controlled to create the feed material called lascas in the hotter portion. Seed crystals are in the cooler portion upon which the lascas redeposits, forming synthetic quartz. This process can take 30 to 60 days, and is also used to grow amethyst, citrine, or rock crystal.
* Flux Melt Method
Pioneered by the French chemist Edmond Fremy, the flux-melt technique is still used to make emeralds. The powdered ingredients are melted and fused in a solvent (flux) in a crucible. The material must be kept at a very high temperature for months, before being left to cool very slowly.
* High Temperature/Pressure Method:
One type of solution growth from water at high temperatures and pressure is known as the hydrothermal technique. Growth from solution is achieved by an increase in saturation. Like adding increasing amounts of sugar to water, the sugar will dissolve until the solution is saturated and can absorb no more and then it will begin to re-crystallize. With cooling, crystallization will increase and with heating it will decrease. A seed crystal is often employed to initiate the crystallization and to provide a point for the deposition to begin. Crystal growth rates are a function of time, temperature, and concentration. Hydrothermal techniques are used to make emeralds, quartz, rock crystal and amethyst.
* Skull Melting Process
This process was perfected in USSR specifically for crystallizing synthetic cubic zirconia, for uses in optical, electronic and laser equipment. Cubic zirconium oxide has a very high melting point and is a very reactive material. No container can hold this melt since cubic zirconia has a melting point of 2750°C, and hence a cold crucible or skull is used.
Imitation stones can be made up of any substance, like glass, paste or strass, faience, porcelain, acrylic, and plastics. Ceramics are the most common and least expensive simulants and they are used as substitutes for many kinds of popular gem materials like turquoise, coral, jade, pearls. Imitation stones are made to simulate a particular gemstone, but they do not have the same chemical, physical, and optical properties of the natural gemstone like the synthetic gemstone and hence can be easily distinguished from synthetic and natural gemstones. Volcanic glass, a man-made substance from obsidian and volcanic ash, is a possible candidate for imitation aquamarine and pale sapphire. Some examples of imitation stones are cubic zirconia, Synthetic Moissanite (Diamond), and yttrium aluminum garnet which are diamond simulants. Since diamonds are so valuable and popular, the market for diamond impostors is huge, and many additional simulants like cubic zirconia, GGG, YAG, strontium titanate, synthetic rutile, and moissanite have been created over the last 50 years. Other imitation stones are Emerald Doublet, Foil Glass (Opal), Imitation Lapis Lazuli, Synthetic Forsterite (Tanzanite), Synthetic Forsterite (Peridot).
http://www.valuablestones.com/imitation.htm
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Is a 1.86 amethyst Gem worth anything? Pics included?
Question:
I have a 1.86 amethyst stone as collateral for my Xbox 360 i loaned to a friend. Now he isnt returning it. Before i go after him with the police he did give me this gem... But i cant seem to find any more information on it, or were i would sell it. There for something tells me the list price on it dosent seem right,.... What do you think, say?
Thanks in Advanced
http://img511.imageshack.us/img511/5766/1000816yb1.jpg
http://img20.imageshack.us/img20/3455/1000817ve9.jpg
Answer:
It is not possible to be exact from a photograph but the colour is very poor and it is very small. The value on the certificate is absolute rubbish (read the last paragraph on the certificate!) Almost all these sealed package "investment" stones are a complete take on designed to part the gullible from their cash I am sorry to say. You can buy stones like that for $5 to $10 in any rock shop. It sounds like a police job I am sorry to say.
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