without a photo it is very difficult to provide an opinion, we could be here for years, what looks like to you might not be what it looks like to me, I hope you understand. There are so many possibilities when it comes to triangle marks.
The ring sounds unique and interesting though and we would have loved to have had the benefit of a photo.
I would not hesitate in having this ring professionally appraised. Photos will be necessary if you choose to have this ring appraised on line.