M J no not 24 hours ya prat lol here ya go pasted this of the sight im a member off lol
SUN & WATER: Hold the stones under running water for a minute and then place in the sun to dry. Not recommended for stones susceptible to fading: Aventurine, Amethyst, Citrine, Rose Quartz, Smokey Quartz
As for where ya get them i mainly go on line now but Natural world is a shop i use they
dont just sell crystalss but there is or should be a trained crytal assiant
Or have you a Evolution shop by you they sell all sorts im not to keen on getting them from there but if its cleansed well enough there ok
Hope this helps abit