Jewel Geyser, Fountain geyser in Biscuit Basin, Yellowstone National Park, US.

Jewel Geyser is a fountain geyser in the Biscuit Basin complex of Yellowstone National Park's Upper Geyser Basin. It erupts frequently, and its vent is ringed by shiny, beaded sinter that resembles small pearls.

Jewel Geyser was first named Soda Geyser by the Hayden Survey. In 1887 Arnold Hague renamed it Jewel Geyser, a name taken from the shiny, beaded sinter around its vent. The geyser sits in the Biscuit Basin complex of the Upper Geyser Basin, alongside features such as Sapphire Pool, Shell Spring and Black Pearl Geyser.

The name Jewel comes from the shiny, beaded sinter around the vent, which Arnold Hague chose in 1887 when he replaced the Hayden Survey's name Soda Geyser. Visitors walk the Biscuit Basin boardwalk to watch the fountain-type eruptions and look for that beaded rim at the opening.

The site is accessible via the Biscuit Basin Trail from the parking area on Grand Loop Road and the path is easy to follow. Eruptions occur regularly, so spending about 15 to 20 minutes watching is worthwhile to see an event.

Arnold Hague renamed it Jewel Geyser in 1887, replacing the Hayden Survey's earlier name Soda Geyser. The new name points to the shiny, beaded sinter around the vent, which looks like a string of small jewels.