Can you solve this riddle?

As these two Greek sphinxes with a female bust, a lion's body, and eagle's wings stand by the central star sapphire in this 18K yellow gold French antique brooch, do they guard this celestial gem just like their Egyptian relatives watch over the entries of sacred places?

However, the Greek sphinx isn't particularly known for their responsibilities as a warden, but for their wisdom demonstrated through riddles. So, it could just as well be that these Greek sphinxes are meant to embody knowledge. Not just any knowledge; in combination with the star in the sapphire, this brooch emanates enlightenment. This would lead us to the freemasons.

Perhaps you can enlighten us on how to interpret this unique piece of art history?

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Click here to get to this Freemason (?) sphinx brooch with star sapphire.‍