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

 * Buy it from relic stores, most likely from Egypt.
 * Break Space Rocks with a Board Breaker. Requires Level 9 of Martial Arts skill (7 for Disciplined Sims).
 * Exploring the mausoleum in the cemeteries.
 * Use the Miner (present in The Sims 3: Ambitions) to find it.
 * Put an assortment of gems and other objects on a Display Rack, making sure the price of ALL items combined makes §3500-5000, then perform the Irreversible Transfiguration. Doing so will give a small spire.
 * Search neighborhood garbage cans
 * Dogs can dig up Tiberium in TS3 Pets expansion.

Cuts
Tiberium can be cut into 2 different forms: No matter what the cut is, Tiberium will grow into a Large Spire Cut within a day, giving it a value of around §40,000 or higher in some cases.
 * 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.