Conglomerate Jasper Bowl—“Puddingstone”- India

Fine polish in hues of beige, green, brown, white and tan, orbicular patterns of rocks in their matrix cut in cross-section, diameter 6 ½in. Sold for $510  (Copyright © 2002-2008 Bonhams 1793 Ltd., Images and Text All Rights Reserved)

Jasper is an ornamental rock composed mostly of chalcedony, microcrystalline quartz, in association with other minerals, which give it colourful bands and patterns. Jasper was a favourite gem in the ancient world; its name can be traced back in Hebrew, Assyrian, Persian, Greek and Latin.

Jasper is often named according to its pattern: landscape jasper, the most popular, offers a small panorama in stone. Ribbon jasper, picture jasper, and orbicular jasper are the names of other varieties. Jasper is found in many countries. It is sometimes used to create bowls and other objects and to adorn buildings, such as the Saint Wenceslas Chapel in Prague.

Bonhams. Natural History, 22 Jun 2008. 220 San Bruno Street, San Francisco // 7601 Sunset Blvd., Los Angeles. www.bonhams.com