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2023

  • May 31st, 2023

    Website was changed to http://www.sumiseki.co.jp/dia

2018

  • July 6th, 2018

    Acquired ISO9001:2015 license at Akabira Plant. (Diamond abrasives manufacturing)

2016

  • April 1st, 2016

    Sumiseki Materials Co. established Dia Materials Corporation through a company split and took over the New Materials Department

2010

  • February 8th, 2010

    Acquired ISO9001:2008 license at Akabira Plant. (Diamond abrasives manufacturing)

2008

  • October 1st, 2008

    Sumitomo Coal Mining Co.,Ltd. changed it's name to Sumiseki Materials Co., Ltd.

2006

  • June 1st, 2006

    Established our nanomaterial research institute

2005

  • April 25th, 2005

    Relocated our main office and New Materials Department to Shimbashi, Minato-ku in Tokyo

2004

  • December 1st, 2004

    Commenced nanodiamond operations.

  • August 11th, 2004

    Website was launched.

2003

  • December 1st, 2003

    A Technical Sales team was established to respond more closely to customer requests.

2002

  • September 1st, 2002

    Commenced mono-crystalline diamond and other abrasive materials operations.

2001

  • May 18th, 2001

    Akabira Plant acquired ISO9001:2000 certification.(Manufacturing of industrial diamond products)

2000

  • April 1st, 2000

    Commenced explosion synthesis and classification operations.

1998

  • October 1st, 1998

    Doubled polycrystalline diamond production.