Are you also looking for some little gift for your family and friends ?
Maybe a simple puzzle cube isn't a bad idea. There are 2 possibilities for using.
1. The cube itself is the gift.
2. You use the cube as wrapping for the diamond for your wife

(or as wrapping for some new bits for your woodworking friend)
I've made the DXF drawing for 8mm, but you can scale it to the size you need. The pics are showing a 10mm example. To be sure that all parts are fitting, select the function 'Corner overcut' in your CAM program. (pic3)
The DXF file will be sent in the next post.