A pearl and diamond giardinetto brooch, set with pearls and graduated diamonds of colourless, brown

A pearl and diamond giardinetto brooch, set with pearls and graduated diamonds of colourless, brown and yellow tint, set in silver and gold, width 8.2cm

A verbal report from GCS states that two pearls are natural saltwater, one pearl is saltwater with indications of treatment (this pearl would need to be unmounted for further clarification)