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September 1980
Jewelry Miura was founded by Toshinori Miura and Keiko Miura.
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November 1981
Jewelry Miura Co., Ltd. was established.
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January 1991
Participated in the 2nd International Jewellery Tokyo (IJT).
Exhibiting annually thereafter.
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1993
Participated in the 1st Japan Jewelry Fair (JJF).
Exhibiting annually thereafter.
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2001
Opened an office in Thailand.
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2005
Launched Purple Gold research in collaboration with three Japanese universities
under an industry–academia–government partnership, supported by a national subsidy.
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2007
Fumitsugu Miura joined the company.
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2008
Closed the Thailand office.
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2009
Launched sales of in-house manufactured Purple Gold jewelry under the brand “Cierin.”
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2010
Registered the trademark “Cierin.”
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2010
Began exhibiting at the Hong Kong Jewellery Show.
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2011
Exhibited at Baselworld.
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2012
Obtained the first domestic patent in Japan related to the Purple Gold manufacturing process.
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2015
Opened an office in Hong Kong.
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April 2020
Toshinori Miura was appointed Chairman.
Fumitsugu Miura was appointed President.
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September 2021
Obtained the second domestic patent in Japan related to Purple Gold.
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2022
Purple Gold was officially certified by the Japan Mint as 18K gold.
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June 2023
Exhibited at the Las Vegas jewelry show.
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August 2024
Obtained the first European patent related to Purple Gold.
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September 2024
Obtained the first U.S. patent related to Purple Gold.