Victorian Multi Page Enamel Turquoise & Diamond Locket

Rectangular locket measuring app. 1 inch (including bails) x 3/4 inch wide, centering a cabochon turquoise (3.0 x 4.0mm), framed by Rose cut diamonds (1.5mm) in a diamond shaped setting with background of black enamel lines and blue enamel lines on reverse. Opens up to reveal six locket compartments, suspended from an 18 inch chain, all fashioned in 18k. Circa 1860