From 'Crown Jewellery & Regalia of the World' by Rene Brus:
I don't recall an occasion where the honeysuckle tiara was worn as a necklace. It was such a lovely wedding tiara for Princesses Tatjana and Angela; and Princess Marie chose it for the pre-wedding reception of Prince Alois and Princess Sophie in Nymphenburg. Princess Sophie hasn't worn it so far, or did she? Unfortunately there are so few pictures of the Liechtenstein Ladies wearing tiaras ...