My knottie and IRL friend CBM328 gave me the idea to use this etsy vendor called Xabia Jewels to have double strand pearl necklaces fastened with a ribbon made for my bridesmaids as a gift (and also to wear with their dresses on my wedding day). I just received them from the vendor last week and the color ribbon wasn't exactly what I wanted, but the necklaces were beautiful! I asked her if she could replace the ribbon and she's doing that for me now. She was really nice about it. Anyway, just wanted to pass on the idea and the link if any of you guys were searching for a gift for your bms. They were reasonably priced. I don't know this woman, so it's not a plug for her, but I was happy with my experience. GL!
http://store.xabiajewels.com/category/wedding-formal-wear