2.5x1.5x0.5 cm. The vibration of the stone is important, not the size or the degree of processing. So if you need an amethyst, then this one from Brazil is ideal. It mainly affects disorders caused by mental overexertion, stress and unprocessed negative experiences, so it is advisable to have it by the bedside table, even close to the head. The cooling effect of these stones will help a troubled head. It will also help to question your conscience - am I not actually marrying in a direction I don't have? Am I taking it too far?