My guess is that a Luxe Diamond is a fancy/brand name for Cubic Zirconia. There are many fancy names to add value to inexpensive Cubic Zirconia. Simulated diamond, again, is a fancy way to say a fake machine made stone. There is no per carat price to CZ like diamonds. There is no real resale value, only value to the person who is interested in the piece its self. More often then most, the only value is in the metal it is set in.