This line of bracelets from Carolina Bucci seems very similar to the expandable/stretchy gold bracelets from Fope. Both seem to use gold springs inside to give the pieces flex.

Her site notes, “

This large K.I.S.S. bracelet features a coil within a coil – with 18k pink gold wrapped around 18k yellow gold. It is inspired by the dual balance springs in Audemars Piguet’s ground-breaking Double Balance Wheel movement.

To be worn casually, even at formal occasions, and styled with a free spirit. Much as one tells the time on one’s watch, without thinking too much about it, these pieces are designed to keep it simple. In fact, Keep It Super Simple. K.I.S.S.”

This piece sells for £12,500.