Peridot is different from Ruby, Sapphire, and Jasper in that she’s just an Era 2 Kindergartner who was made with limited resources, and therefore limited natural abilities common among older Gems (shapeshifting, phasing removable clothing/accessories, etc.). That’s why she was equipped with limb enhancers and extra tech to do her job.
Still, she does have metal powers. >>110918104
mentioned Peri’s new visor, but until we see her actually remove them at some point in SU Future, I’d argue that’s a permanent part of her new form.