peridot

He would often spend a whole day settling and resettling in their cases the various stones that he had collected, such as the olive-green chrysoberyl that turns red by lamplight, the cymophane with its wirelike line of silver, the pistachio-coloured peridot, rose-pink and wine-yellow topazes, carbuncles of fiery scarlet with tremulous, four-rayed stars, flame-red cinnamon-stones, orange and violet spinels, and amethysts with their alternate layers of ruby and sapphire.