Hi Barry,

I tried your method and am getting some odd results - please disregard the shape change of the objects.
When selecting all objects to arraygem:



When selecting the top right object, it seems to go upside down:



Also, I noticed that the 'gem' stays rigid and so if it were to be recessed into the ring, the amount of recess will be different:



Sorry to be a pain but I like your method and would like to work it out.

Many thanks,
Gunter