Tiberium

Tiberium is a gem present once The Sims 3: World Adventures is installed.

About Tiberium
Tiberium is a very rare and often valuable gem. The ore itself is around §100, and getting it cut greatly increases the value of the gem. Whether it is a raw ore or cut, it will give a Sim a negative moodlet (-25 mood), so it is best kept out of a Sim's inventory. No matter what its form, it will glow and make a soft "ping" when placed on lots.

Getting Tiberium

 * Exploring the catacombs in mausoleum.
 * Rummaging the trash can in a wealthy residential lot.
 * Buying one from relic store.
 * Breaking space rocks with board breaker.
 * Digging up a dog dig spot as a dog.
 * Entering the dimensional gate with PlasmaPunch Gyroscopic Conductor.
 * Searching for gem as a dog or werewolf.
 * Casting Conversion Ritual spell as a witch.

Cuts
Tiberium can be cut into 2 different forms: No matter what the cut is, (whether it's heart, small spire, or raw) Tiberium outside Sim's inventory will grow into a Large Spire Cut within a day, giving it a value of around §40,000. With Supernatural installed, even the powder will grow into a Large Spire cut if processed through the Gem cutter. Henceforth the Gem cutter is a great way to double (or more) the profit.
 * Small Spire Cut (§6500)
 * Heart-Shaped Cut (§1000)

Spreading
The claim that Tiberium can spread propagated early on after its introduction into Sims 3 in hopes that it would mimic its behavior in the Command & Conquer universe. This, unfortunately, has been disproven by many threads such as this on the official Sims 3 Forums.

Trivia

 * Tiberium is present in the Command & Conquer series as a fictional substance that is central to much of the plot of the story. The series was made by Westwood Studios and later acquired by EA.
 * Tiberium is one of the most valuable materials available that is associated with a spawner (namewise) that is placeable via BuyDebug, alongside Supernovium, Compendium, Mummitomium, Plutonium, Opal, and Soulpeace. Tiberium spawners will also spawn Luminorious Gems alongside other less valuable gems, most notably amethyst.