A small circuit-board charm that lights up jewelry.
One module in the Charmware series.
All surface-mount components:
Design notes thread (Mastodon)

Screenshots of the board preview, gold on matte black. The back shows arcane gems and swirls on the left (forming the CR1225 battery clip footprint). The front shows Art Deco/Nouveau-inspired geometric and organic embellishments, forming the circuit (LED + resistor + switch), along with the Charmware logo. Minuscule silkscreen markings provide some guidance. Not shown: vias connecting the front to the battery pads