I know "Jack" and I am looking for help...please!

[Ireland]

I purchased this really sweet Celtic Pendant in a little shop in Kilkenny, Ireland this spring. It is a circle about the size of a quarter with celtic knots twisting around the inside circle. It has three colbolt blue glass inlayed arrows that jut-out from the circle. At the top of the circle is the Irish harp as well as a small clover to the left of the harp and a wild flower to the right. Also dead smack in the middle is a dime size inlayed copper. brass or pink gold (many opinions given on that part)

The marking's read as follows from left to right

I J CY then in the next grouping there are three boxes that have two symbols that I can not make out and the third being an R.

I will be able to upload a pic in a few days just thought I could put it out there for some ideas and feed back.

Thanks in advance.

Irish Jade