Anyway here is what I can see?? and in the order left to right
Something that looks like A.C.Co It looks as though there is a dot under the lower case 'o' (Could this be the maker... Albert Cohen?)
A Crown
18
Then is what looks like Sword with 3 sheaves of hay. (Could this be the Chester mark?)
Then there is a sort of swirly 'O' Could this be the (Chester date mark for 1914?)
Here is a pic of the ring it does have some sort of stone in it.



