Is catawiki safe for minerals?

Hi everyone, I’m considering buying a large amethyst geode (around 80–110 cm) from Catawiki and I’d like to hear real experiences from collectors. I may have found one that is beautiful but its quite pricey and i dont know it i should trust and online site for such a big investimenti, especially because it would be my first time doing it. I know it’s not a random marketplace and they have experts, but I’ve also heard mixed opinions especially about color accuracy in photos, overestimated valuations, condition issues discovered after delivery, dispute resolution, etc... For those of you who actually bought minerals there (not small specimens but display pieces): Is it generally safe? Are the experts reliable? Would you trust it for a >3000€ purchase?