A custom, perfectly circular, small modern hoop. Opens and closes with a hinge. Pull at back hinge to open. Push to lock onto post and listen for a "click" to ensure it's locked properly. Dipped in 14k gold with a high polish. 

14K gold-dipped brass, silver-dipped brass
finish: high polish
latch back

product measurements
length: 0.67" / 1.7cm
width: 0.7" / 1.8cm
depth: 0.16" / 0.4cm
weight: 0.12oz / 3.43g

imported