Late Victorian Diamond Crescent Brooch jade Partial English hallmarks

Partial English hallmarks

or a brooch/pendant back - swipe to see

Modelled in 9 karat gold throughout

I can't find much online about John McKean Esquire

With a simple machined border

Late Victorian Diamond Crescent Brooch jade Partial English hallmarksDATE: Victorian, c. 1890 Striking antique crescent brooch dating from the late Victorian era, circa 1890. It's set with three central icy white diamonds with further graduated diamonds at each of the points, with fine millegrain detailing. Crafted in 15 karat gold and platinum throughout. STONES Old cut diamonds MEASUREMENTS 5. 3 x 0. 4cm WEIGHT 3. 57g MARKS No marks present, tests as 15k gold and platinum CONDITION Good, few scratches to the platinum