For your consideration is this nice blue green guilloche egg. It can be used as a charm or pendant. Just beautiful with vibrant green and blue enamel. It has a center decorative leaf band. I can not find a mark but it has tested and is guaranteed as sterling silver. The sterling has a nice gold wash. I wonder if it is not an Oriental piece and I believe it is circa 1920s.
It measures 3/4 inches across and is 14 mms wide at center. Pictures are enlarged.
I used a flash so that you can appreciate the wonderful guilloche. Any white spots or glare are a result of the picture taking and the enamel and this piece are in excellent condition with no damage.