Hinged Hoop Earring Back:
This system has a carefully crafted spring hinge at the base of the earring allowing the earring to open; at the top of the earring there is a post to pass through the earlobe. Once the post is in the earlobe, the earring can be closed, safely securing the open end of the post in the back of the earring.

Diamonds On Web, Jewelers - Retail, San Francisco, CA
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