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  • lezing geode zwijndrecht - belazeriet

    17-9: Lecture ‘Gem or Scam?’ for Geode Zwijndrecht

    Geode Zwijndrecht: Develsteincollege Develsingel 5, Zwijndrecht, Netherlands

    During the club meeting of Sept. 17, 2025, I will give a lecture on "Gem or Scam?" for Geode Geological Society in Zwijndrecht (NL). In…

  • mineralenbeurs rijswijk - stand stapel van stenen i01 - okt 2025

    04/05-10: International mineral show Rijswijk

    De Broodfabriek Volmerlaan 12 2288 GD Rijswijk Volmerlaan 12, Rijswijk, Nederland

    During the show on October 4 and 5, at the booth i01 of Stapel van Stenen (Stack of Stones) and Henk Rijneveld FGA (gemologist) you…

  • lezing belazeriet of niet Zonhoven

    11-10: Lecture ‘Gem or Scam?’ for Geolithos

    Evenementenhal Den Dijk Rozenkransweg 4, Zonhoven, Belgium

    During a meeting of the Belgian geological society Geolithos on Oct. 11, 2025, I will give a lecture on "Gem or Scam?" at Evenementenhal Den…

  • lezing LVGA Friesland - belazeriet

    18-03: Lecture ‘Gem or Scam?’ for LVGA Friesland

    Natuurmuseum Fryslân Schoenmakersperk 2, Leeuwarden, Netherlands

    During the meeting on March 18, 2026, I will give a lecture on "Gem or Scam?" for the Frisian division of the national geological association…