I thought the third was one Grace bought, wore once and than gave to Caroline for her wedding. I think that tiara was also part of one of the exhibitions about Grace.
--Previous Message-- : I don't think she owned the third one. It was : featured in a Point de Vue article in the : 90s on Van Cleef & Arpels, and the : ladies (princesses of one sort or another) : modeling the jewels were all wearing : house-owned pieces, not : borrowed-from-private-owners. I think this : Grace tiara adorned Constance of : Bourbon-Parme. :