Your wife is a very lucky lady! My husband hates jewelry of all kinds, with the exception of his wedding ring and his Claddagh I bought him on our trip to Ireland. But he only wears it on St. Paddy's Day! The good watch? Forgot that, he uses his phone...I barely know how to answer mine.
I've attached a picture of the pendant in the shadow box. It's not great, and was hard to photograph as the sun is finally out today, so rather glaring! I keep an eye out for shadow boxes at thrift stores, but worse case go to Michael's as they have many different sizes. This one is very plain. Has a simple narrow black frame and black velvet lining. Then just pinned it in. The worst part was centering and it's still not perfect!
Post pictures of your Singer pieces. I do love his work. And you're right, some of ihis bolos are huge! But I think you can wear it with more than denim shirts! Get your wife in on that!