Sterling filigree and micro mosaic ring - needs repair

I found this ring in a second hand/antique store in Delevan, WI. Inside you can make out half the words 'sterling' and 'Italy' - some of the mosaic pieces have fallen out and I'm trying to find more information on this piece or find someone who could date it, and possibly repair it. I absolutely love this ring and have never seen anything like it before. It was a perfect fit for my ring finger which is a 4-1/2. I appreciate any help or referrals. Thanks!