Demi Lovato, 27, gave fans a pleasant surprise when she announced her ensgagement to The Young and the Restless star Max Ehrich, 29, via a photo of her flashy diamond ring on July 22. So, HollywoodLife spoke EXCLUSIVELY with the mastermind behind the oval-cut ring — celebrity jeweler Peter Marco — who revealed even more details about the decision process that went into the multimillion-dollar purchase, and Demi’s reaction to her love token.