Large amethyst-lined geodes are often expertly cut to display their internal amethyst crystals. They are then sawn and fitted with a weighted base to enable them to be used as an item of home or office decor.

Agate-lined sections of lava tube geodes have frequently been used to make “cathedral geodes” that are several feet high. These are cut in a way that nicely exposes the amethyst-lined chamber, they are then sawn to produce a flat base, which is filled with metal-weighted concrete to enable the geode to stand upright, the edges of the cavity are sanded for nice appearance, and the entire exterior is painted to hide the scrapes and scuffs that occurred during collection and transportation. Many of these large geodes sell for thousands of dollars each.