Striking variations of color differentiate the stones of these bookends; the organic design of their bases was inspired by the natural patterns in the rock. The gems are natural outgrowths from the inside of ancient lava streams, with traces of crystal, agate and amethyst. RabLabs Fim bookends are therefore, the ideal way to end your row of treasured books. Assembled in the United States. Approximately 4 x 4.5 x 4.75.