LisaGWB

My husband recently acquired a 1926 Victoria Coupe from his Uncle's estate. The day he brought it home, the gear shift knob broke off (in pieces). From what I could see of the remains, it was a granite or marble ball or something like that. I would love to get a replacement piece for him - or at least be advised as to what would be an acceptable substitute. The rest of the car is original! Any advice would be appreciated. Thank you!