Gem collecting

Gems are collectibles in The Sims 3.

Raw
Gemstones are found in the rough.

Tiberium
Tiberium is a special gem. As an ore, it is worth §75-125. When the ore is kept in inventory, Sims will become nauseous. If left out, there's a good chance the ore will change into a Large Spire Cut which glows green. Sims can also get it cut, but only the Spire Cut and it is not nearly as valuable. In both ore and spire form, it periodically puts off a glowing green "splash" and has a soft "ping" sort of noise that goes off at the same time. In Large Spire form it is incredibly valuable - upwards of 40,000 simoleons.

Cuts
Gems may be sent to the gem-cutter and cut into the following cuts. You start with the Emerald cut, and gain cuts by cutting gems.

Sometimes the gemcutters will return an uncut gem, saying that it is actually a Mysterious Mr. Gnome in disguise.

The table lists both when you break even with a particular cut, and when a cut begins yielding better profit than the previous cut.

For example, if a gem is worth §47, an oval cut provides §70 while the Pear cut yields §82. Factoring in the cost of the gem and the cost of cutting the gem, the Oval cut provides a §3 profit while the Pear cut yields no profit. The Pear cut does not start providing more profit than the Oval cut until the original worth is §60, as listed below.

Transformation
The Sims 3 World Adventures includes a new item transformation mechanic, in which certain items placed on display cases can be combined to form new items. This is a list of what can be created.

Gems
Soulpeace Gems

Skull Cut Gems

Large Gems

Random Cuts

Metals
Large Ingots

Compendium

Supernovium