7th Heaven S06E18 - The Ring

Matt and Sarah argue over their wedding plans and their agreement to forgo buying an engagement ring, and seek Eric for advice—who is not happy with Matt for getting engaged in the first place. Through the advice of Eric, Matt buys Sarah a fake engagement ring. Mary and Lucy fly to Buffalo for a weekend, or at least that is what Lucy thinks, as Mary makes plans of her own. While there, Lucy meets a police officer named Kevin who confiscated her bag, and he invites Lucy and Mary to a double-date with him and his brother—but with a big surprise in store for Mary.