There’s currently a $20,000 Ritani engagement ring hidden somewhere in L.A. right now. If you’re lucky, you might find it! The L.A. Diamond Dash, an event sponsored by Sarah Leonard Fine Jewelers, is a city-wide treasure hunt where couples play and follow clues to find the coveted prize. Competitors are given challenges via text message and must trek around L.A. by foot (or bicycle, but cars are prohibited) on a hunt of a lifetime.

Spots, however, are limited. So if you want to participate in the event, you must register here.

The Diamond Dash takes place on Sunday at 12 p.m., but if you want a sneak peek of the entire Ritani collection beforehand, check out the Ritani trunk show at Sarah Leonard Fine Jewelers this Friday and Saturday. Mention Engagement 101 to receive a free gift!