This is truly beautiful.  A wonderful example of an Edwardian clear rhinestone brooch which is set in hallmarked Silver  and reworked into a pendant.  I have linked a 22ct gold plated belcher chain to the pendant, bringing a masculine touch to the femininity of the main piece.  The necklace measures 16 inches in length.
 
Please measure your neck to ensure that the necklace is the right size for you.
Model's neck is 12 inches in circumference.