Rare drop table

The rare drop table is a special list of items. When slain, some monsters have a chance to give loot from the rare drop table instead of loot from their own unique drop table. This chance usually ranges from 1/16 to 1/64. Unlike the standard drop table, the rare drop table is shared by many monsters ranging from chaos druids, to lesser demons, through to most Slayer monsters and the Kalphite queen.

A ring of wealth affects how the rare drop table works. It removes most of the "empty" slots on the rare drop table. Therefore, the odds of receiving items is increased. A ring of wealth does not affect how often the rare drop table is accessed. So, when wearing a ring of wealth, the rare drop table will not be triggered more often, but when it is triggered, the player is more likely to receive an item.

Definitions

 * 100% drop - Most creatures have what is called a '100% drop', which they will drop every time they are defeated (for example bones or ashes).
 * Main drop - This will be an item drawn from a creature's drop table based upon a random 'roll' (imagine a dice roll or roulette wheel).
 * Drop table - This is a list of all items that a creature could possibly drop. The percentage chance of receiving each item varies, often depending upon the item's relative value.
 * Rare drop table - Occasionally, a creature can give access to a drop table of more valuable items. To receive items from this drop table, you must first "roll" to land on it from the main drop table.
 * Second drop - Some creatures also have a second drop. Second drops in the game include the draconic visage from various Dragons, boss pets and hard clue scrolls/elite clue scrolls.
 * Quest drops - in some instances, a creature will drop a quest-specific item (e.g. the unique bones required for the Rag and Bone Man quest).

Items on the rare drop table
The RDT contains a main table, with 128 slots. This table has two sub-tables, the Gem Table, and the Mega-Rare Table. The Gem Table has a weight of 20/128, which contains mostly gems but also half keys, rune javelins, chaos talismans, and nature talismans. The Mega-Rare Table has a weight of 15/128, and contains mostly empty drops, but also rune spear, dragon spear, and shield left half. Wearing a ring of wealth will remove some empty drops from the Mega-Rare Table.

Runes & Ammunition - Drops for Members Only

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Resources - Drops for Members Only (4 basic gems for F2P)

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Miscellaneous - Drops for Members Only

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Armour and equipment - Drops for Members Only
All drop probabilities taken from http://forum.runescape.com/forums.ws?317,318,288,65354165
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