It's not a new approach to the ring, by any means. Women have long been getting married in their mothers', grandmothers' and great-grandmothers' rings. Lately, though, the tradition has become a full-fledged trend, with forward-thinking brides looking increasingly backward for their jewelry.
Beyond the obvious meaning (and vintage charm) that characterizes "recycled" rings, whether from a family member or an estate sale, there's another, "greener" pro: An antique ring consumes no virgin metals, ditto for heirloom gemstones.
Next, where "green" meets yummy.