Items
Golden hammer - 100% XP boost in smithing when smithing bars.
Goldsmith gauntlets - Chance to smelt 2 bars at the same time (50% chance).
Golden apron - Chance to cut 2 gems at the same time (50% chance).
Golden chef's hat - Chance to cook 2 fish at the same time (50% chance).
Cooking gauntlets - 25% XP boost in cooking when cooking fish.
Gloves of silence - 50% XP boost in thieving when stealing from stalls.
Opal Ring - 50% XP boost in thieving when stealing from stalls.
Magic secateurs - 15% XP boost in farming when harvesting herbs.
Farming ring - Chance to get an extra herb when harvesting herbs (16% chance).
Infernal pickaxe - Chance to get smithing XP while training mining (equivalent to the XP you would get from smelting the bar).
Infernal axe - Chance to get firemaking XP while training woodcutting (equivalent to the XP you would get from burning the log).
Infernal harpoon - Chance to get cooking XP while training fishing (equavilent to the XP you would get from cooking the fish).
Sets
Angler's outfit - 10% XP boost in fishing when wearing the whole set.
Pyromancer outfit - 10% XP boost in firemaking when wearing the whole set.
Prospector outfit - 10% XP boost in mining when wearing the whole set.
Lumberjack outfit - 10% XP boost in woodcutting when wearing the whole set.
Farming outfit - 10% XP boost in farming when wearing the whole set.
Graceful outfit - 15% XP boost in agility when wearing the whole set.