PRESS & MEDIA
Finnish magazine Etela-Saimaa 20th October 2020. Interview "One second in the history of gems" narrated by me, Esko Hamalainen.
Spectrolite in Cannes Film Festival
Lufkins: Tucson Book of Mineral Show, Minerals & Fossils 2019, Spectrolite Finland Ltd
Letter of thanks from President Urho Kekkonen to Esko Hamalainen 1979: