Bob DeMaria has joined the staff of Rochester Diamonds Inc. as sales manager. He has 15 years of jewelry sales and management experience. Charles & Colvard Ltd. has appointed Barbara L. Mooty to the position of vice president, brand development and industry relations. Mooty has more than 25 years of jewelry industry experience, most recently as vice president of marketing for Kristall Classics, a manufacturer of diamond jewelry and special-cut Russian diamonds. Amy Greenbaum has been selected to lead the Jewelers Vigilance Committee's marketing and development efforts. Greenbaum, who has more than 20 years of communications, special events, and fundraising experience, will develop marketing and fundraising programs for JVC. Thaigem.com, an online gem and jewelry supplier, has appointed Simon Bruce-Lockhart, FGA, DGA, E.G., as the new head of its in-house gemological department.