The 22" Black Onyx & Snowflake Obsidian gemstone necklace has an Onyx Pendent. Round and oblong silver beads separate the onyx and obsidian snowflake. Onyx pendent is 1 1/2" in diameter. Connection is a magnetic clasp. It has been believed for centuries that Black Onyx repels negativity and deflects the negativity of others, keeping one safe from harm. Snowflake Obsidian is believed to help with the integration of mental balance between the right and left hemispheres of the brain.