Grosse vintage pave crystal & gold tone cube pendant necklace

Crystal pave stylized rectangular cube (I think technically called a rectangular prism) pendant necklace. I'm not sure if it's gold tone, gold plated, vermeil, or what, but the gold tone is bright, saturated, and consistent throughout. Not quite yellow gold, a bit more bronze. Excellent, gently used condition. The only places I could find any signs of wear were on the clasp (see pic 10) and the back of the metal tag (2nd to last pic), both just have very light normal wear. The cube measures about 8mm x 7mm x 7mm. The chain is about 15.25" long and can be extended to 17". Questions &/ offers welcome! (lowballs ignored)