A pair of enamel, diamond and pearl earrings

A pair of enamel, diamond and pearl earrings, mid 19th century, each composed of concentric rings of turquoise enamel, accented by cushion-shaped and rose-cut diamonds and centred on a pearl, interlaced with gold ribbons applied with blue enamel, suspending a pearl pendant, to surmounts set with cushion-shaped diamonds, length 5cm each, hook fittings, diamond surmounts and hook fittings possibly later