Don't count them out without trying one on. I have a SMALL wrist(literally 6.5"). I love wearing the new Venom(52mm) I just got. I have 2 Excursions(50mm), 2 San III's(50mm),1 Corduba(50mm), a Reserve Grand Diver(47mm), a 0358 Luminary Sport at 53mm and an Ocean Ghost at 47mm. The smallest watch I have that I wear is my Midsize SubAqua Noma IV, and the only reason I got it was cause it has an SW200 movement. Once I can track down a Reserve Grand Diver with the SW200, I'll probably sell off the SAN IV. I've had two 8926's and ended up selling both. They just looked like a women's sized watch after wearing the larger sized ones.13630 Pro Diver, the SAN models are too big for me.
I also have a small wrist, but I have 5 Invicta's that are 50mm and they fit just fine. I am starting to go a little smaller, the 43-48mm range seems to be the best fit. If you see a 50mm that you like at a good price you should try one out, you could always return it, the Subaqua III's and IV's are beautiful and they are getting cheaper. Enjoy the diver.13630 Pro Diver, the SAN models are too big for me.