Material: Citrine

Fire Mountain Gems tells us:

"From the earliest of times, citrine was called the "sun stone" and the gemstone was thought capable of holding sunlight and useful in the protection from snakebites. Its color was associated with gold and it became known as the merchant's stone. It was thought to improve communication and to attract wealth. To the Romans, it was the stone of Mercury, the messenger god, and it was used for carving intaglios.

"Citrine is the November birthstone and for the zodiac sign of Scorpio (Oct. 23 - Nov. 21). Citrine has been referred to as the "success stone," "merchant's stone" or "money stone," due to a superstition that it would bring prosperity. Because of its yellow color, citrine is thought of as a joyous stone with sunshiny energy to brighten up the lives of those who work with it and wear it.

The color of the solar plexus chakra is yellow, so citrine is associated with this chakra. It is thought to have a positive influence that can relieve backache and combat depression, negative energy and problems with the liver, spleen, digestive system and the bladder."

https://www.firemountaingems.com/resources/encyclobeadia/gem-notes