its about 20 inches long and i was thinking around twenty dollars for this necklace if you think it should be more or less tell me and tell me where i can sell it with the internet being the last resort here are some pics
The answer to your question is both. Blue quartz does occur naturally however many types such as agate and chalcedony are often stained to improve the colour. Hydrothermally grown synthetic quartz crystals are also produced in blue by the addition of various chemicals. Sorry this answer does not resolve the question but rather confuses it.
Its natural, thereare blue granite quarries around Austin Texas.