A charming ring dating around 1930. This presumes the pearl is cultured so post 1925 and the cut of the emeralds is pre 1940. 
There are no markings, the ring tests electronically as 18ct gold. 
The pearl is a light cream and 6.5mm diameter. One or two light blemishes which you would probably expect from an early cultured pearl.It is held in place by two gold pins through the centre of the pearl.
On either side are two beautifully deep green , flat faced square emeralds. A few inclusions, enough to indicate they are natural emeralds but really very nice indeed. They measure 3.0 to 3.5 mm each side. Roughly 0.15 ct each.
The shoulders have a rounded almost leaf detail and the shank grades down to very narrow at the back - very Deco. 
Ring height  0.3 inch 9mm
Size L 1/2 (UK), 5 7/8 (US) 
Sizeable - it has not be sized and would have been a good size for a twenties/thirties female but on the smaller side now.
Weight 2.79 gms