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    Unlike milky quartz, quartz pure color lasts from a matter of seconds to a maximum of a minute or two. Therefore, you must

    remove these stones quickly from the heat as they change. If you delay, the centers will turn a golden yellow color. At that

    point, you’ll have a tricolor stone with a green center and blackish ends. If you take too long, you’ll have a tricolor

    with a golden yellow center.