These beautiful water bottles, with semi-precious gemstones in the bottom, hold 500 ml and include a tea diffuser and an extra bag of gemstones. They can be used for water, for tea, or for diffusing fruit to make a healthy alternative to pop or commercially-flavoured water. The glass is double-walled borosilicate glass and can be used for cold or hot beverages. The lid and base are bamboo. They are heat resistant, dishwasher safe, microwave safe and freezer safe. In the summer I like to make tea in mine at night and pop it in the fridge, and the next day I just add ice and have iced tea. It’s also nice to add tonic water and some white wine to a fruit diffusion to make a spritzer.