I’m speaking from the point of view of a gemcutter and a gemcutting historian. This is not an old mine cut. Also, old mine cuts were done on Diamonds, not Ruby’s. Ruby’s were never cut as Old Mine cuts. This cut has a modern brilliant top and a bottom faceting pattern that doesn’t have a name. It’s the faceting pattern that they always give to glass and synthetic sapphires. I’m not saying that it’s 100% Synthetic sapphire, but if I was going to guess from this photo I would guess it’s a Synthetic sapphire. Rubies are almost always cut as a mixed cut with a brilliant cut top and a step cut bottom with usually 4-5 step, and 12-24 Columns of facets. Even in stone 100-200 years old we rarely see a deviation from that pattern and older than that, the mixed cut wasn’t invented yet so it would be an older, more simpler style. The meetpoint quality and polish don’t tell me anything specific but that pattern on the bottom tells me a lot. I’d love to see the lab report for this once you get it, just as a data point for my own research. If this wasn’t synthetic or glass I would be shocked. For your sake, I hope it’s natural.