10k Tourmaline / Garnet (?) colour changing stone sz 7

Beeeeeautiful colour changing garnet or tourmaline (or natural zircon?) 10k solid gold ring. This one is special - it changes colour! In natural light it’s more of a grape colour and it changes to a beautiful deep red in artificial light. Truly one of a kind. It was sold to me as a natural stone (and I do think it is) but I’m not gemologist. The stone is surrounded by a halo of genuine diamonds. It’s a lovely made ring. 💕