Gem collecting

The Sims 3 World Adventures includes a new Gem combining mechanic, in which gems placed on the large display case can be combined to form new gems. This is a list of which gems create which new gems when combined.

Gem Combinations
These are gem combos and what they create. Please list gems in alpha order, and list combinations underneath, also in alpha order. (Diamond before Emerald, Topaz before Quartz, etc)

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Huge Emerald Cut Diamond


 * Diamond(3) + Emerald(2) + Smokey Quartz + Topaz(2) = Huge Emerald Cut Diamond

Old Valuable Nectar


 * Compendium Ingot + Heart-shaped Soulpeace +  Large Heart-shaped Gem + Large ingots(2) + Large Spire Cut Tiberium(2) + Mummotonium Zot