Borosilicate glass teapots Gyokuro by Cristel: Gyokuro is the newest teapot in Cristel's teapot range. It joins the ranks of Sakura, Oolong, Rooibos and Darjeeling. The modern design combines elegance, while the large removable filter makes it easy to steep all types of tea. It allows the user to see all the flavors by observing the leaves and color of the tea. A teapot resolutely made for lovers of tea and herbal tea.