It's akin to setting an emerald - you just need a lot of experience to avoid breaking anything Yes, my mother-in-law loved the pendant. Designed to be an everyday piece, very simple but elegant.
I'm not sure what the value is these days.... there is a fair amount of oregon sunstone, and public awareness remains pretty low.
My guess it that the 11ct precision-cut stone we put in that ring, given the color being as close to a pure red as sunstone gets (which is orangy-red at best), is probably worth $5,000-ish net, wholesale (so $500/carat). That is a complete and total guess though....
I think @gemwise just wrote a chapter on Oregon Sunstone in his 2nd edition of Secrets of the Gem Trade.... so he is probably more current than I.