Actually, the pendant looks appealing to me. This was Queen Frederica's favorite. She wore it as a brooch too. Most of time, Queen Sofia has worn this together with a pearl necklace.
I like that Queen Sofia wore this when they all went back to Greece for a Memorial Service to King Paul's 50th Death Anniversary in 2014.
For me, Queen Sofia has one of the most impressive 'personal jewelry collection.' Extremely elegant and rich in history.