Sparkly 10K White Gold Pendant / White Sapphire and Diamonds / Marked Mexico / Circa 20th Century

Another almost invisible mark on this pretty little pendant made it a must have. The clasp has a 10K mark so I'm guessing it's a white gold chain. There are other letters or marks but I can't make them out with my little 10x's magnifier. There also seems to be a mark on the pendant's mounting loop. I did finally figure out the others marks. The clasp had an N/C 10K maybe nickle content white gold. The Pendant loop was marked Mexico with hallmarks and 10K. The stones are all prong set and open in the back. A trip to the jeweler determined the large center oval stone is either a white sapphire or topaz. The jeweler was a bit uncertain. He was sure however that it's framed by smaller oval diamonds. Nice surprise ! -Mike-