Amethyst

Amethyst is one of the 8 Infusable gemstones. It can be infused by laying the stone in a riverbend by moonlight for eight hours. Infused, it has a variety of uses:
 * Herblore: grants increased Perception.
 * Weapon: grants lesser Lifesteal.
 * Lens: lets the viewer see 5 seconds into the future.
 * Clock: makes it run on time.
 * Self-Infusion: slows experienced time.