JEG: I love both looks.
BN: The disco ball clasp on the Hanadamas was ordered special for me by PP. I asked for white gold with CZs instead of diamonds, and a screw clasp instead of a fishhook. I think PP was very hesitant about my request, but when the clasp came in, it looked amazing.
The clasp on my first akoyas is from Fire Mountain Gems. I don't know what the base metal is, but it's plated with gold and has crystals of some sort. It never tarnishes and the crystals are very sparkley. For a "faux" clasp, it's held up very well. I keep thinking of replacing it with a better quality clasp when it starts looking bad, but it looks great. It's also a screw clasp.
Both disco balls are incredibly sparkly in bright light.
For clasps I never intend to open I like the screw clasps because they just look like a bead. There's no claspy bit hanging out. For clasps I know I'll need to open and close a lot, I prefer the fishhook style or an orbit clasp.