I'm Oscar Bautista, a professor, lapidarist and jewelry designer. Our video is all about the steps involved in precious and semiprecious stones lapidary process. A volcanic crystal was used in this case. Are you interested in learning how to lapidate gems? Do you need precious and semiprecious stones for your business? Contact us: Mobile (+57) 319 2399816 talladegemas@hotmail.com www.facebook.com/joyaspiedras.oscarbautista Bogota, Colombia