Instructions
Hold the turquoise in your hand for about seven minutes. If it begins to warm, it is plastic.
Examine the turquoise closely. Real turquoise will have some natural color variation. This will be especially noticeable if you are examining turquoise beads. If they are real, they will all be slightly different shades.
Obtain a signed statement from the dealer that the stone is in fact real turquoise, specifying how it has been treated and from which mine it was extracted. Federal law requires all dealers to provide such a statement upon request.