"The flexible Greek Ruby Parure includes a tiara in an olive wreath motif, with berry-colored rubies and diamond leaves. It belonged to Queen Olga of Greece, who likely received at least parts of the parure from her husband King George I. (Some also cite her Russian roots – she was born Grand Duchess Olga Constantinova of Russia – as a possible source for the rubies.) Olga left the rubies to her son, Prince Nicholas, and they were worn by his daughter, Princess Olga of Yugoslavia. Olga’s sister Princess Marina, the Duchess of Kent, borrowed the rubies at least once. Eventually they came back to the main Greek royal family and were worn by Queen Frederika, consort of King Pavlos I. The rubies were among the jewels Frederika turned over to Princess Anne-Marie of Denmark when she married Frederika’s son King Constantine I, and the set has been worn by Anne-Marie ever since. These days, she prefers a shortened version of the necklace." --The Royal Order of Sartorial Splendour
The Badens, also descended from a Greek princess, have an almost identical one. The laurel wreath makes sense for Greek princesses, after all.
