Edwardian c.1910 ring with a central stone that is a double rose-cut diamond. Double rose-cut is much higher and has more facets than a regular rose-cut. The diamond is approximately 1ct colour H , VS2-SI1 
There are 18 surrounding diamonds colour H-I, SI1-SI1 clarity. All are natural earth mined diamonds. Weight of ring 3.56 gm gold 18k (Tourbillon set means raised up)
Face of ring 11mm/ 18 mm ( till where the diamonds finish )
Size of ring 7.75
£2,550