The overlapping C's look like the Cartier logo in my opinion, they made jewelry for royalty which could indicate the crown stamp. I personally think you have a nice piece here that should be looked at by a cartier rep or reputable jewler in person just in case you have somthing really nice on your hands.
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Crown Marks by: Anonymous
Hi Tiffany,
this mark does not look familiar to me, other than the crown. Is there a cross at the tip of the crown? Many makers used the Crown mark and I could not tell if that was a cursive L or an I - any idea? Laguna did make jewelry and used a cursive L as their marker's mark. It's been a pleasure to assist you today.