Source of photos - Barbara Hutton

Hello,I currently work for a documentary for Van Cleef Arpels and I try to locate the source of the 2 photos you use of Barbara Hutton :1. Barbara Hutton wearing the Queen Amelie of Portugal Ruby Necklace2. Barbara Hutton wearing the queen Amelie of Portugal Ruby Necklace converted to a tiara and the double-stranded golden yellow Japanese Pearl Necklace

I thank you in advance for your help,
S. Nadeau