Watermelon Tourmalime Set in 18K Gold ! Antique? One Of A KIND hand Crafted

this piece leaves me pretty speechless. feel free to make me an offer. 🤷‍♀️🤷‍♀️🤷‍♀️ watermelon tourmaline gold marked 750 along with an AR AK or AU - it is hard to tell. I'm looking for a certified gemologist to appraise this. I imagine it might be worth a pretty penny. I can't find anything online even remotely like this. especially with the stamping on the sides and back is different for sure.