While 45-carat Hope Diamond sparkles in a Smithsonian in Washington, D.C., just across the river in Alexandria, VA, jewelry stores mesmerize with their own shiny gems and on-trend, handcrafted designs. Mystique curates hand-selected pieces from designers like Jude Frances, Alberto Parada and Jaime Joseph, while at Olde Towne Gemstones, collectors find colorful and elegant stones fashioned into pendants and earrings on site. Thousands of colorful strands line the brick walls at Potomac Bead Company, where gemstones, seed beads, glass and tools let visitors create wearable masterpieces of their own.