At the southernmost tip of New Jersey lie the resort town of Cape May and its sparkling sandy beaches, sheltering the Delaware Bay. Formed by melting glaciers thousands of years past, the Delaware River flows from its headwaters to spill into the Delaware Bay. And for thousands of years, fragments of quartz rock have ridden the river, plucked from the mountains lining its banks. Polished and buffed as they tumble along, these rock particles dazzle like gemstones when tossed onto Cape May's sandy shores. Beloved by beachcombers, these "diamonds" are the daughters of the river, linking the state's past and present.