Someone asked me if I could make a cross that could have a stone in it, I didn't have a stone so used a marble instead. The principle is exactly the same you just have to make the hole the shape of your chosen insert!
My Amazon page with some of the tools and equipment I use in my videos.
UK: https://www.amazon.co.uk/shop/garyhuston
US: https://www.amazon.com/shop/garyhuston
Etsy store: https://www.etsy.com/uk/shop/GaryHustonStore #GaryHuston #Blacksmithing #Farrier #ASMR #Horseshoeing #Fabrication #Ironwork #Hoofcare #welder #repairs #horse #farriery #engineering