Andrew Morton said this about Princess Michael selling diamonds in a book he wrote in the late 80's.He never actually said he knew it as a fact but was a rumour. Kensington Palace denied it saying the property is Prince Michael's not his wife's and was his children's inheritance so had not and would not be sold. I also don't believe for one minute that Pm would attend state banquet's etc wearing fake jewels, I imagine she'd rather wear none at all.