A sweet Art Deco platinum wedding ring.  This style of wedding band was popular during the late Art Deco, World War II era.  It's a bit of a spin on a plain, round wedding band.  The inside of the ring is round and the outside is an octagon.  Rather unusually for the time period, the inside edges are rounded a bit to give the ring a more comfortable fit on the finger.  The sides are flat so it sits nicely with other rings.  This ring has a very slight circle pattern engraved on each of the points of the octagon.  Circa 1940s, European in origin.  

Hallmarks: Platinum, also tested.  
Size: UK - K; US - 5 3/8; EU - 50.  Not sizeable without disrupting the shape.

Approx 2.07 mm wide by about 1.4 mm rise off the finger.
Weighs 2.65 grams.