Shiny three-leaf clover necklace was removed from RuneScape after an update, but still exists in-game for those who had obtained it.
The shiny three-leaf clover necklace is obtained via Treasure Hunter and boosts experience by 2% in all skills when charged and equipped. The necklace starts with 10 charges that give the player the chance of winning certain items. Once all charges are depleted, the necklace becomes a purely cosmetic item.
Obtained new, the necklace comes with 10 charges. For every 10 minutes of skilling or combat, the necklace will use up one of its charges. Every time a charge is used, the player has a 10% chance of receiving a reward from the reward table. If the player doesn't win a reward, player will be rewarded with coins equal to the content of a small cash bag.
If a player wins a reward, the reward will automatically show up in the player's inventory or in the player's bank in the case where the inventory is full. No messages appear in the player's chat box when this happens unless the game chat filter is set to on.
Once the necklace is depleted of all of its charges, the necklace becomes a purely cosmetic item. The 2% experience boost is also lost when this happens. There is no way to recharge the necklace.
If a player enters the reward table, they have the opportunity of receiving one of the following items: (note that the rarity is after the player manage to get into the reward table; e.g. even though an item may be common, it is still rare when considering there is only a 10% chance to even enter the reward table.
When a player enters the main reward table, they have a chance of landing on the rare reward table slot. Doing so will give them the chance of obtaining one of the items listed below items. As with the main reward table, the rarity is for after the player was able to enter the rare reward table. Players will receive a large cash bag if they already own the item that they were to receive.