Mexican Mayan hand carved black obsidian mask pendant necklace

This is a gorgeous Mexican Mayan hand-carved black obsidian mask pendant necklace. It looks black from one angle and shimmery green from another. Purchased at the local stores near the “Teotihuacan” pyramids archeological site. Comes with an adjustable silk cord which you can wear as long or short as you’d like. Weighs 21.2 grams and is 2 inches long. In unused vintage condition.