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Finnish magazine Etela-Saimaa 20th October 2020. Interview "One second in the history of gems" narrated by me, Esko Hamalainen.

A Story of Spectrolite Finland Ltd in Goldschmiede Zeitung, Germany October 2014


Spectrolite in Cannes Film Festival

John Lufkins: Tucson Book of Mineral Show, Minerals & Fossils 2019, Spectrolite Finland Ltd

Financial Times 1985; A story of Mr. Esko Hamalainen,owner and manager of Spectrolite Finland Ltd, former mayor of Ylamaa, iniator of gem training in Finland; founder of the Gem Centre Ylamaa, Gem Museum and Ylamaa International Gem Show in Ylamaa Finland

Letter of thanks from President Urho Kekkonen to Esko Hamalainen 1979:

FB Reports News, 1985; A story of "One man show" about Mr. Esko Hamalainen in a newspaper in 1985