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It has been known for four decades that the addition of aluminium to gold could result in purple gold. The initial product, however, had problems with discolouration when expose to sweat. Since then we have collaborated with three universities in the research and development of purple gold.

Throughout the researches we have developed a coating technology that is 7 to 10 times harder and more durable than ones before. Now the purple gold is coated with a very thin clear film, called nano-coating, which prevents discolouration. Because this clear film does not crack or peel, we could finally launch Cierin jewellery collection in the market

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