In 1962, when Greek Princess Sofia married King Juan Carlos of Spain, the Greek shipping magnate Stavros Niarchos made her a magnificent gift - a parure of rubies and diamonds made by Van Cleef & Arpels. It was a suite of necklaces, bracelets and earrings that could be worn on the head or around the throat.
Here is Queen Sofia wearing the whole thing in various combinations:
The earrings have now been worn by her granddaughter Crown Princess Leonore: