If you are looking for a textbook example of the legendary "Ježek" or hedgehog profile, this 11.17-gram specimen delivers perfectly. Even though it's a more accessible cabinet size, every millimeter of the glass is covered in a dense web of sharp, needle-thin teeth. It gets its name from the Vltava River (known as the Moldau in German), where the first documented pieces were found. 
 
While standard river stones got tumbled and smoothed out over time by rolling river gravel, this specimen stayed safe in its protective clay bed, preserving its delicate extraterrestrial sculpting exactly as it formed millions of years ago. It is an ideal size for keeping in a pocket or sitting directly on your desk. Creatives and writers find this stone particularly useful for busting through frustrating blocks. It helps clear out mental fog and sparks sudden flashes of out-of-the-box inspiration, making it a fantastic companion when you are brainstorming a new project or trying to solve a complex business problem.