Don't miss these Rising Stars at the JCK Las Vegas Design Center in June.1. (Above) Fluted ring in platinum with sapphires and diamonds; $15,000; Erik Stewart, Tucson, Ariz.; 480-734-7805; erikstewartjewelry.com 2. Ring in 18k gold with olive green moonstone; $5,900; Karin Jamieson, Cincinnati; 800-390-8424; karinjamiesonjewelry.com3. Large Pebble necklace in 18k gold with diamonds; $2,500; Susan Wheeler, Chicago; 312-968-6643; susanwheelerdesign.com4. Malak rings in 18k gold with diamonds; $13,920; Nada G, Beirut; 96-13-59-1179; nadag.com5. Mismatched Crescent Moon and Stars earrings in oxidized silver and 18k gold with diamonds; $2,300; Genevieve Yang, Santa Rosa, Calif.; 650-387-3491; genevieveyang.com