Otherworld colors were some of the first dice we experimented with. They have a special additive in them that interfere with the normal light spectrum. A photo cannot do this design justice and this 7 piece poly set is a mix of beautiful peacock and golden green pieces. Due to low stocks of this style it is a mixed set, some golden green and some peacock green. Crystal dice are covered by US Patents #5938,157; #6,318,720; #D455,462.