This is the pyramid you will receive - 35.5mm x 38.9mm x 38.9mm

Obsidian is an excellent grounding, protection and transmutation stone. Obsidian stimulates visioning during meditation.   Blue Obsidian stimulates and enhances all forms of communication and lingual skills, when used at the throat chakra.  It aids divination, psychometric and psychic development pursuits. Also provides intuitive knowledge when travelling.  It enhances creativity.