turquoise stone and brown glass necklace

Gorgeous 18 inches with a super easy nice hook How can I tell if turquoise is real? First, rub a cotton swab with pure acetone ( nail polish remover). Then apply it to the questionable turquoise stone and wait 10 minutes to see if any green or blue color transfers off the stone along with the liquid. If the turquoise you're examining is real turquoise, the blue color will not rub off.