Spiral Studs Set Amethyst Sterling Silver. Meadowlark. $235.00. Or 6 payments from $39.17What's this?. Hypnotic spirals, nature’s favoured form for the transmission of energy, the spiral radiates out and draws in simultaneously, infinitely and eternally. Each spiral is finished with the prettiest stone in the centre. - Sterling Silver set with Amethyst stone. Size. OS - $235.00. Quantity.