very pretty sparkly butterfly pendant necklace stamped ATR 925 CN

very pretty sparkly butterfly pendant necklace stamped ATR 925 CN ( pic 3) . Delicate chain, open back detail on the butterfly pic 13 , Prong setting for the larger rainbowish colored sparkle pieces . There is a very tiny 925 stamped on the tongue part of the lobster claw pic 12 for a closeup. ~ 18 " chain.. ruler and a quarter in pics to help with size visualization. The stones remind me of mystic topaz I have no way of varifying if they are real , synthetic. lab made or glass but they are pretty . And as a Scorpio I bought them thinking they were mystic topaz , as topaz is the gemstone for scorpio zodiac sign . I live in the country now and never get to wear anything so delicate doing farm house chores. The white dress form's neck is ~ 14.5" pic 8 shows how it hangs on that size neck. Questions are always welcome.