Jasper is a type of quartz, usually red because of the iron minerals in it, but it can also be yellow, orange, brown or green in color. It’s typically used for decoration or as a gemstone to make practical or ornamental items, and yes, also for Yoni Eggs.
The Red Jasper gemstone is associated with endurance, physical strength, life, energy, passion, energetic protection, and power. It’s also thought that it can heal wounds, improve the blood circulation, detoxify, increase libido, and stimulate fertility.
As for the Chakras Red Jasper correspond with, it’s mostly related to the Root Chakra (Muladhara Chakra), which is connected to ideas of Kundalini Awakening, grounding, stability, vitality, and insight.