The 703-carat "L’Heure Bleu" recently earned Guinness honors as the world's largest cut tanzanite. Carved by New York City-based artist Naomi Sarna, L’Heure Bleu was officially weighed in at the Rice Northwest Museum of Rocks & Minerals, Hillsboro, OR, by Guinness World Records adjudicator, Michael Empric. Several years ago, Sarna was invited to travel to […]