What elements are needed to create a quantum emerald in Little Alchemy 2?

In Little Alchemy 2, there is no element called "quantum emerald." The game does not include this specific item, so it cannot be created through any combination of elements. If you are looking for advanced or rare elements, I recommend exploring combinations related to gems, minerals, or technology, as these categories often contain hidden or complex recipes. If you have any other questions about elements that do exist in the game, feel free to ask!