Entered the precious metals business under the name of Kuwayama Chain, founded by Yukihiro Kuwayama in Sumida-ku, Tokyo
Established as Kuwayama Metal Chain Co., Ltd in Sumida-ku, Tokyo
Established Uozu factory (later changed the name to Technical Center, then transferred the operation to Toyama factory in February, 2000)
Transferred the head office to Taito-ku, Tokyo
Established Miyazu factory (the current Toyama factory) in Uozu-city, Toyama
Changed the company name to Kuwayama Precious Metal Co., Ltd.
Built a new head office in Taito-ku, Tokyo
Opened Kofu sales office in Kofu-city, Yamanashi (changed the status to Kofu branch in March 1994)
Increased capital to 352 million yen
Absorbed five subsidiary companies
Opened Osaka sales office (changed the status to Osaka branch in March 1994) and Fukuoka sales office (changed the status to Fukuoka branch in April 2001)
Increased capital to 747.5 million yen
Established an affiliated company, Wuxi Jinteng Jewellery Co., Ltd. in Wuxi Jiangsu, China (acquired the whole share capital in January 2005)
Registered the stock as over-the-counter securities with Japan Securities Dealers Association (currently listed on the Jasdaq Securities Exchange, Inc.)
Increased capital to 1,341.5 million yen
Established Kuwayama Europe N.V. in Antwerp, Belgium
Increased capital to 2,952.7 million yen
Increased capital to 3,013.52 million yen
Acquired the management rights of Christy Gem Co., Ltd. in Bangkok, Thailand to expand the manufacturing capacity for jewelry
Established KUWAYAMA HONG KONG CO.,LTD. in Hong Kong
Changed the company name to "Kuwayama Corporation"
Acquired the whole share capital of NJ Corporation, a jewelry wholesaler, to enhance the product planning and sales force
Established Brilliance International Japan Ltd. to enhance the event sales business
Established K.C.D Corporation
Acquired the stock of Clair Co., Ltd.
Established Kuwayama Jewellery Guangzhou Corporation in Panyu, Guangzhou City to enhance the production capacity for the Chinese market.
Established HAKKO International Corporation as a wholly owned subsidary of NJ Corporation to expand the sales especially in the western market in Japan.
Reorganized "Kuwayama Hong Kong subsidiary" into 'Kuwayama International' with head office function.
Sanyo Co., Ltd. completes TOB (currently delisted on the Jasdaq Securities Exchange, Inc.)
Merges NJ Corporation and HAKKO International Corporation. The operation continues under the NJ Corporation name.
Due to a structural change in the international diamond industry, KUWAYAMA EUROPE N.V. finished its function and closed.