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Date Name Thumbnail Size Description Versions
03:53, 6 December 2008 Scenic jasper.jpg (file) 91 KB Scenic jasper. Image courtesy of topsieraden.nl 1
07:06, 8 August 2008 PinkTourmalineOval5 32ct.jpg (file) 46 KB   2
06:24, 8 August 2008 RedTourmalineOval5 32v02.jpg (file) 34 KB   2
06:21, 8 August 2008 RedTourmalineOval5 32ct.jpg (file) 42 KB Heat treated brown-red Nigerian tourmaline. Image courtesy of Roger Dery. 1
00:24, 21 May 2008 Lapis Afghanistan.jpg (file) 75 KB Top quality untreated lapis lazuli cabochon from Afghanistan (50.60 Carats). Image courtesy of Scott Davies, americanthain.com 1
00:18, 21 May 2008 Colorless forsterite.jpg (file) 53 KB Image courtesy of Scott Davies, Americanthai.com 1
10:19, 6 December 2007 TaaffeiteGroup.gif (file) 92 KB 10 taaffeites. Photo courtesy of Brad Payne. 1
05:27, 2 December 2007 Polarizer without polarizing direction.jpg (file) 8 KB A polarizing filter. By Doos 1
05:27, 2 December 2007 Polarizer with polarizing direction.jpg (file) 9 KB A polarizing filter with the pass-through direction indicated. By Doos 1
05:26, 2 December 2007 Wire-grid polarizer2.jpg (file) 13 KB A wire grid polarizer (east-west bars). By Doos 1
05:25, 2 December 2007 Wire-grid polarizer.jpg (file) 14 KB A wire grid polarizer. By Doos 1
08:23, 7 November 2007 Trapichesapphirepair2zo9.jpg (file) 640 KB A 100ct trapiche sapphire.<br /> By Chaman Golecha. 1
08:22, 7 November 2007 Trapichesapphirepair1am4.jpg (file) 516 KB Trapiche sapphire.<br /> By Chaman Golecha. 1
04:06, 19 October 2007 Adding arrows interference.jpg (file) 10 KB By Doos 1
04:06, 19 October 2007 Adding arrows addition.jpg (file) 11 KB By Doos 1
05:32, 18 October 2007 Adding arrows reflection diffraction.jpg (file) 39 KB   2
04:19, 18 October 2007 Adding arrows reflection diagram.jpg (file) 43 KB Close up of reflection on different spots of a mirror with arrows.<br /> By Doos 1
06:41, 17 October 2007 Adding arrows reflection.jpg (file) 24 KB   2
10:23, 29 September 2007 Diamond dot structure.png (file) 10 KB By Doos 1
04:16, 28 September 2007 Immersion reflection.png (file) 39 KB Refraction in a mineral and the lack therof when immersed in a liquid of equal index of refraction. By Doos 1
05:22, 26 September 2007 Anderson method2.jpg (file) 19 KB Illustration of the immersion method by B.W. Anderson for comparetive index of refraction. By Doos 1
07:39, 25 September 2007 Plato immersion.png (file) 12 KB Illustration of the "becke lines" in the Plato immersion technique. By Doos. 1
08:27, 24 September 2007 Anderson rims.png (file) 18 KB Illustration to show the different shadows casted by a brilliant cut gemstone. By Doos 1
06:29, 24 September 2007 Anderson method lens.png (file) 12 KB Illustration of light bending through a lens (after Dr. W.Wm. Hanneman). By Doos. 1
04:16, 24 September 2007 Anderson method.jpg (file) 17 KB Illustration of the immersion method by B.W. Anderson for comparetive index of refraction. By Doos 1
11:44, 20 September 2007 Verneuil.png (file) 21 KB   3
11:41, 15 September 2007 Sideritemm2.jpg (file) 58 KB A rare faceted siderite. Notice the strong doubling of facet edges easily visible. By Chaman Golecha, Gem Testing Laboratory, Jaipur 1
04:14, 12 September 2007 Ekaniteed8.jpg (file) 41 KB A green radioactive ekanite. By Chaman Golecha, Gem Testing Laboratory, Jaipur. 1
07:57, 7 September 2007 Cubic Zirconia Run Opening.jpg (file) 1.93 MB Picture by Larry P kelley Shows a cubic zirconia 'run' after being removed from a skull crucible and broken open. (Taken from public domain) 1
07:01, 7 September 2007 Skull-melting2.jpg (file) 38 KB Skull-crucible method to create synth. cubic zirconia By Doos 1
06:19, 4 September 2007 IMG 0871.JPG (file) 874 KB Courtesy of Dave Gibson http://www.geocities.com/davegibson46/ 1
06:18, 4 September 2007 IMG 0839.JPG (file) 470 KB Courtesy of Dave Gibson http://www.geocities.com/davegibson46/ 1
05:04, 4 September 2007 Gemtrade.jpg (file) 6 KB secrets of the gem trade image for monthly book 1
07:43, 1 September 2007 Sublimation1.png (file) 29 KB By Doos, adapted from US patent 34861 1
06:49, 30 August 2007 Diasporeccwz3.jpg (file) 71 KB Diaspore (colour-changing from green in daylight to brown in incandescent light - also known as “Zultanite” in the gem market). By Chaman Golecha, Gem Testing Laboratory, Jaipur. 1
02:40, 30 August 2007 Mandarine garnet hf.jpg (file) 263 KB Inclusions in a mandarine garnet. By John Huff, gemcollections.com 1
03:25, 29 August 2007 Axinitesm2.jpg (file) 41 KB A pinkish/greenish brown axinite. By Chaman Golecha, Gem Testing Laboratory, Jaipur. 1
09:42, 27 August 2007 Sillimanitefibrousdyessf1.jpg (file) 59 KB A fibrous sillimanite dyed red simulating a ruby. Such sillimanites are dyed in different colours to simulate various stones like ruby, sapphire, emerald and others. By Chaman Golecha, Gem Testing Laboratory, Jaipur. 1
09:41, 27 August 2007 Sillimanite2hy8.jpg (file) 57 KB A brown sillimanite. By Chaman Golecha, Gem Testing Laboratory, Jaipur. 1
08:20, 27 August 2007 Danburiteyq8.jpg (file) 63 KB A colorless danburite. By Chaman Golecha, Gem Testing Laboratory, Jaipur 1
10:19, 26 August 2007 Trapiche emeraldme9.jpg (file) 70 KB A magnificent trapiche emeralds encountered at the Gem Testing Laboratory, Jaipur which formed a suite with 3 others weighing 40.65 ct in total and said to be cut from a single rough crystal - has been reported in "Gems and Jewellery" (December 2006). By 1
05:23, 25 August 2007 Clinohumite diffraction spectrum.jpg (file) 11 KB By Doos. 1
04:59, 25 August 2007 Clinohumiteyv8.jpg (file) 129 KB A 9.45 ct brownish orange clinohumite tested at Gem Testing Laboratory. Courtesy of Chaman Golecha, Gem Testing Laboratory, Jaipur. 1
09:41, 24 August 2007 Spectrum natural blue spinel iron.jpg (file) 14 KB Spectrum of blue natural spinel (colored by iron). By Doos 1
09:38, 23 August 2007 Spodumeneyellowom7.jpg (file) 29 KB Faceted yellow spodumene. By Chaman Golecha, Gem Testing Laboratory, Jaipur. 1
09:38, 23 August 2007 Spodumenegreenvt6.jpg (file) 23 KB Faceted green spodumene. By Chaman Golecha, Gem Testing Laboratory, Jaipur. 1
02:50, 23 August 2007 Phenakitetv6.jpg (file) 26 KB A facetted colourless gem quality phenakite. By Chaman Golecha, Gem Testing Laboratory, Jaipur 1
02:06, 18 August 2007 Syntehticforsteriteha1.jpg (file) 57 KB Synthetic forsterite By Chaman Golecha Gem Testing Laboratory, Jaipur 1
11:23, 15 August 2007 Topazcatseyest4.jpg (file) 28 KB By Chaman Golecha 1
11:22, 15 August 2007 Topazparticolouredek7.jpg (file) 47 KB By Chaman Golecha 1
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