![A ring made from purple gold is displayed at a jewellery store in Singapore September 7, 2005. Invented by a metallurgy professor at Singapore Polytechnic, purple gold acts like a gemstone, adorning A ring made from purple gold is displayed at a jewellery store in Singapore September 7, 2005. Invented by a metallurgy professor at Singapore Polytechnic, purple gold acts like a gemstone, adorning](https://l450v.alamy.com/450vfr/2d2gx4y/un-anneau-en-or-violet-est-expose-dans-un-magasin-de-bijoux-a-singapour-le-7-septembre-2005-invente-par-un-professeur-de-metallurgie-a-l-ecole-polytechnique-de-singapour-l-or-violet-agit-comme-une-pierre-precieuse-ornant-les-anneaux-et-les-pendentifs-en-or-blanc-et-ameliorant-l-allure-des-colliers-de-diamant-l-or-violet-est-cree-en-melangeant-l-or-avec-d-autres-metaux-tels-que-le-palladium-et-l-aluminium-il-comprend-environ-80-pour-cent-d-or-pur-la-reaction-chimique-cree-la-couleur-violette-cprod-reuters-nicky-loh-nl-fa-2d2gx4y.jpg)
A ring made from purple gold is displayed at a jewellery store in Singapore September 7, 2005. Invented by a metallurgy professor at Singapore Polytechnic, purple gold acts like a gemstone, adorning
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