This article, Richstone, was created by Stinkowing.

Uncut RichstoneRichstone
Members Yes
Quest item No
Tradeable Yes
Equipable No
Stackable No
High alch 200,000 coins
Low alch 150,000 coins
Destroy Drop
On death Unknown edit
Store price 12000 (five onyx gems in inventory are required to buy from store) coins
Exchange price 76,000,000 coins
Examine This looks valuable.
Weight 0 kg

A richstone is a gold gem used in Crafting. It can be obtained by trading five onyx gems to the TzHaar crafting store owner, or a gift from the Mysterious Old Man. Unlike the other gems, richstones cannot be fletched into gem tips for bolts. Richstone jewelry can be enchanted with the Enchant Richstone spell at 97 Magic.

Richstone Jewellery
Unenchanted Enchanted Effects Charges
Richstone ring Ring of prosperity Makes enemies drop twice as many coins then usual. 200 drops
Richstone necklace Regal necklace Increases rewards total from Manage Thy Kingdom. Also allows players to teleport to Miscellania 9 teleports
Richstone amulet Amulet of vehemence Raises all combat skills except Constitution two levels above maximum. Infinite charges
Richstone bracelet Bracelet of extinction Increases healing potency of Pest Control rations by 30%. Also increases damage dealt by players to the portals 10 rations

Richstone items all require the Royal Trouble quest to craft, as the regal necklace is useless without it. They all require 98 Crafting.