Uncut emerald

Ironman verdict

At least 9 monsters drop it. The easiest is Cockroach drone (level 4, 1/170.67); the best rate is TokHaar-Ket Champion (level 112), at Always, about 2 per kill. You can also make it yourself: it takes 26 Divination and gives 5.7 Divination XP, using 2 × Bright energy and 3 × Uncut sapphire. Other sources include Gnome Restaurant, Casket, Mystery box (random events) and Ice troll grunt, plus 4 more listed below. Making ten takes 20 × Bright energy and 30 × Uncut sapphire and gives 57 Divination XP. Reaching level 26 Divination takes 8,740 XP in total; the Divination calculator counts the actions and materials to any target, and the Divination guide has the Ironman training route. 2 recipes use Uncut emerald, including Emerald and Uncut ruby. Uncut emerald is available on free-to-play worlds too. It is tradeable on normal accounts, but an Ironman cannot use the Grand Exchange or trade for it, so the sources on this page are the whole list. High Alchemy turns one into 30 coins, which is 20 less than the shop price, so buying it to alch does not pay.