Obsidian - Blue £1.90 Quantity: at £1.90 each 4 in stock. Candle Color: Light blue. Chakra: Throat. Element: Water. Associated herbs: Gardenia, kelp, and rosewood. Planet: Neptune. Zodiac: Pisces. Blue aqua obsidian will help with all aquatic pets. Use to help children overcome fear of the water. Use for any bodies of water that are environmentally damaged. Blue obsidian is a natural enhancer for all problems related to bodily fluids. In the home it will help you to calm feelings of anger and frustration. It is a stone of protection and will protect against negativity and should be used for psychic self defence. Use blue obsidian to enhance any spells using the element of water .