Tiffany stone is sometimes referred to as bertrandite which is not correct. The most significant difference between the two is bertrandite is a mineral, tiffany stone is a rock. Rocks are made up of different minerals, minerals are crystalline solids which means they're made up of crystals.
This tiffany stone pendant has been reduced because there are some minor polishing issues on the surface of the stone. Although not visible whilst the pendant is being worn, they can be seen with careful inspection.
Should you not be totally satisfied with your purchase it may be returned for a full refund (T&C's apply).