Lapis Lazuli Tesserae is made with 2 cm x 2cm with thickness of 4mm, we are offering it for swimming pools and for spa, we are also offering different borders for swimming pools. Lapis lazuli can be used in salt water too, it has no toxic effects and can be used in extreme weather conditions too and dont have any problem with cleaning chemicals.  lapis lazuli is being used as for different healing and health benefits. so in swimming pools it is also good to use lapis lazuli. we have Four grades, Grade AAA (80-90% Blue ), Grade AA ( 70-80% blue ), Grade A ( 40-50% blue ). All stones are cut from same material but we do the selection for grades. Mix grade is without selection.