According to its website, The Pear Ring is the opposite of engagement rings. Wearing one signals to others that an individual is single and looking to strike up a relationship. The website also claims that this is a real-life social experiment live in the U.S., U.K., Germany, Canada, and Australia and will be launched in other countries soon.

https://interestingengineering.com/culture/what-is-pear-ring-rid-dating-apps