With our Tero Vido Expander, a customer found many Lonsdaleits at a depth of approx. 3 m. These are very valuable, like you can check on following links. https://www.etsy.com/de/listing/736142841/vintage-stein-lonsdaleit-diamant-401-g, https://en.wikipedia.org/wiki/Lonsdaleite.
We are always excited about the treasures that our customers discover with our Tero Vido products. Thank you so much!