Crystal Necklace from France - Price: 2500.00 in Welches, Oregon

Unique antique necklace from France, given to my great, great grandmother in the late xxxx's.  I have had it appraised and they can find nothing like it anywhere and it is in perfect condition. " Consists of 25 12mm round clear quartz beads with very good polish and symmetry.  14K yellow gold, tested.  The beads are flat wire wrapped (four wires on each) and connected with rings,  It is 17 inches long and secured with a barrel clasp at the barrel end.  A cross pendant is formed with six of the beads." 
They were only able to give me estimated retail replacement value because of the "one of a kind" nature of the piece.