Day 122-Spring Green Large Diamond Optic
If you just cannot tell if a water bottle is large diamond or not, check the sides. The diamonds on the side are often more obvious than the diamonds on the front.
The photo above shows the Spring Green Large Diamond Optic from the side so you can see two diamonds on the upper side with one diamond underneath. They are easier to see if you have the actual water bottle and you can rotate the glass back and forth in the light.