{"id":48062,"date":"2026-04-30T11:05:53","date_gmt":"2026-04-30T09:05:53","guid":{"rendered":"https:\/\/www.ssef.ch\/?p=48062"},"modified":"2026-04-30T11:05:53","modified_gmt":"2026-04-30T09:05:53","slug":"fake-it-til-you-break-it-oddities-and-fraud-cases-submitted-to-ssef","status":"publish","type":"post","link":"https:\/\/www.ssef.ch\/fr\/fake-it-til-you-break-it-oddities-and-fraud-cases-submitted-to-ssef\/","title":{"rendered":"Fake it \u2018til you break it: Oddities and fraud cases submitted to SSEF"},"content":{"rendered":"\t\t
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By Dr. Michael S. Krzemnicki, first published in Facette 30<\/a> (March 2026)<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Apart from beautiful and exceptional gemstones, the SSEF also gets from time-to-time submissions which clearly fall far from that prestigious range. Oddities, imitations and evident fraud cases,
where somebody has been cheated or presumably tries to cheat unaware buyers. The following is a short tour-d\u2019horizon through such cases which we encountered in the past few months at SSEF. Most of these cases are detected by simple gemmological testing.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Purple glass sold in Zanzibar jewellery shop as tanzanite<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The first example is an unfortunate holiday souvenir. Bought as AAA- quality tanzanite with a \u2018certificate of authenticity\u2019 in a jewellery shop in Zanzibar (Tanzania), the owner submitted the stone to us for a second check. Unfortunately, we had to tell our client that the purple stone of 6.12 ct was made of glass, exhibiting under the microscope classic swirly features and no pleochroism when checked with the dichroscope.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Purple glass sold as tanzanite. Photo: A. Chalain, SSEF.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Interestingly for us, the purple colour of the glass is related to rare earth elements (REE), namely neodymium and erbium, both elements known to cause purple to pinkish colours in industrial aluminosilicate glass. Due to the presence of these REEs in this glass, the refractive index (1.67, singly refractive!) and the specific gravity (SG: 3.45) were both distinctly higher than commonly observed in aluminosilicate glasses. However, both values are close to the RI- and SG-values of tanzanite, perhaps intended by the producer of this glass to hide the true identity of this imitation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Blue glass sold as tourmaline with a fake \u2018ID card\u2019<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Blue glass submitted as tourmaline with swirly inclusion features characteristic for glass. Photo: L. Phan, SSEF; Microphoto: M.S. Krzemnicki, SSEF.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\tThis case is a classic. A beautiful stone of exceptional size (240 ct) with an appealing Paraiba-like colour, an outstanding clarity, and a fake \u2018report\u2019 by a dubious \u2018lab\u2019 using fake signatures describing the stone as tourmaline. Who would not be stunned to see or even buy a Paraiba tourmaline of such quality? Our testing quickly revealed that the stone is an industrial sodium-calcium silicate glass, coloured blue by admixture of copper traces. Although nice to look at, it\u2019s value dropped near to zero after testing at SSEF.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Dyed quartzite bangle labelled as \u2018high-quality natural jadeite\u2019<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Another classic case: Green dyed quartzite imitating jadeite is a common tourist trap on jade markets in Asia. In this case, however, the bangle was sent by an Asian client together with a document, in which he claimed to be a gemmologist and owner of a \u2018gemmological laboratory\u2019 and in which he described in detail the acoustic resonance analyses carried out on this item as his proof that it is indeed high-quality jadeite-jade (type A).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Dyed quartzite bangle and with Raman spectrum revealing its identity. Figure: M.S. Krzemnicki, SSEF.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The reality is that basic testing of this bangle with the refractometer or a quick check with the microscope would have ruled out jadeite immediately even for a fresh gemmological student. Our testing with advanced methods clearly revealed that the bangle is made of quartzite, a rock consisting of small colourless quartz grains (see Raman spectra above). In addition, this quartzite bangle was heavily impregnated with a green dye with the aim to fraudulently imitate jadeite of high quality.<\/p>

In summary, this dyed quartzite bangle indeed resonated well within our team of acoustic experts at SSEF, but obviously not in sync with the claims of the client and the provided documentation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Octahedral disillusionment<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\tAs in the past, colourless octahedral diamond look-a-likes were again submitted to SSEF in the past few months by several clients. These imitations were carefully crafted, even partially with triangular polishing marks on the octahedrally shaped stones to mimic natural trigons. The presented samples are typical for this kind of fraud, using for example topaz which has very similar specific gravity as diamond or synthetic moissanite, which has a thermal conductivity very similar to diamond and thus may deceive an unexperienced consumer when tested with a simple (inadequate) diamond tester.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Two diamond imitations cut as octahedra to mimic rough diamond crystals. Photo: L. Phan, SSEF.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Trigonal polishing marks on the topaz imitating a rough diamond. Microphotos: J. Xaysongkham, SSEF.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\tAlthough we provide our clients in case of such imitations often an unexpected and disappointing result, we see it as our mission to offer jewellers and end-consumers a fast and safe identification service to prevent misuse and fraud and finally by this maintaining also in the future the confidence of the public in gems and the gem trade.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Apart from beautiful and exceptional gemstones, the SSEF also gets from time-to-time submissions which clearly fall far from that prestigious range.<\/p>\n","protected":false},"author":10,"featured_media":48064,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[626],"tags":[725,743,736,734],"library_category":[],"library_author":[],"class_list":["post-48062","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-blog","tag-diamond","tag-jade","tag-othergemstones","tag-tourmaline"],"acf":[],"yoast_head":"\nFake it \u2018til you break it: Oddities and fraud cases submitted to SSEF - SSEF<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ssef.ch\/fake-it-til-you-break-it-oddities-and-fraud-cases-submitted-to-ssef\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fake it \u2018til you break it: Oddities and fraud cases submitted to SSEF - 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