MOP will lose their luster and shine if it comes into contact often with sweat or water. I should also note MOP could shrink over time if constantly in contact with water. I’ve worn my sweet MOP necklace & bracelet daily and wipe them dry immediately after a shower and I’m personally fine with losing some luster and shine knowing I can replace the motif (around $200 USD/motif) if I choose to down the line. That being said, I baby my VA GMOP alternating bracelet more than the sweets because the glow and iridescence from the VA size MOP is more obvious due to it being larger and darker (for GMOP). When the motifs are bigger it can also be more prone to scratching just because of the larger surface.
Personally I wouldn’t layer a chain bracelet with a bangle like the Signature as the chain bracelets will have tendency to slide under or over the bangle, consequently scratching both bracelets at once. A way to reduce this is by wearing the chain bracelet tight and snug around the wrist. Even stacking two or more chain bracelets can overlap and scratch each other at some point, so if you are fine with replacing motifs down the line from scratches it is fine to layer.
If you are ok with trading convenience (leaving it on at all times) for loss of some luster & knowing you’ll eventually replace each motif I think it’s also fine to wear for showers & low impact gym activities. I would not wear any fine jewelry especially with stones for swimming in a pool/ocean, I think it’s a bit too damaging.
