Why can’t anyone ever steal some nice rubies, sapphires and emeralds?
Lab grown corundum is cheap, even cut and polished. I think the show has been over for rubies and sapphires for a while.
Alibaba has 1 ct uncut diamonds going for $50/carat, which seems about right. Cut diamonds still seem to be fetching over $1000/ct for a 1 to 2 ct stone.