Their most "high-end" London Blue Topaz from Brazil is called "Marambaia London Blue Topaz". This heart is called just "London Blue Topaz", so it may be from less famous location. Maybe Brazilian, but not necessarily Marambaia.
London Blue Topaz (from around the world) is not a cheap stone. But is it valuable? I don't know... Its colour is completely artificial. You'll never find this shade in nature.
