Stacy Keibler -- Ring of Death

Stacy Keibler doused herself in George Clooney repellent yesterday, trying on a giant yellow diamond ring designed by Jacob Arabo ... aka Jacob the Jeweler, jeweler of the stars.

Clooney, the world's most infamous bachelor, has long maintained he will never get married again (he was married for a few years to actress Talia Balsam).

His last girlfriend, Elisabetta Canalis, told an Italian magazine in 2009 that she hoped to be a bride someday. Less than two weeks later, they broke up.

A source close to Stacy says don't read too much into the pics -- it was just an event, and Stacy was asked by Jacob to wear the ring.

But on her left hand?