The Jade is designed to be a little more stable for players who loved the Diamond, but as their game developed needed a disc that could handle a bit more speed. It sits very comfortably in the hand, with a good tactile feel to the plastic and it holds the angles well. You CAN turn it over but unless you really force it, it fades back at the end. A very nice, reliable, and moderately stable disc.
Gold line is premium blend plastic. The start of the mix has been the same brand plastics used in Opto line but we added a different polymer to give it better grip without losing the excellent durability of Opto line.