This is a nice piece of Moldavite from Chlum. This piece weighs 3.68 grams.
Metaphysical crystal description: Moldavite is a high vibrational crystal that radiates energy, and upon first touch, you can feel the warmth it gives off. This warmth is so common that it has developed the term “Moldavite flush”. The “flush” sends vibrations through the body and will imbue the user in a light tingly sensation. Some new users say it is a little over-whelming and will take it off or out of there pocket periodically as they feel “lightheaded”. Its usually recommended to always have a grounding stone nearby when you first start working with it to help avoid Moldavite being too strong. Over time, the strength will be less overwhelming as you get used to the stone.