Ruby

Ironman verdict

5 monsters drop it. The easiest is Goblin statue (level 70, 30/602); the best rate is Onyx dragon (level 126), at 10/128, about one every 3 kills. You can also make it yourself: it takes 34 Crafting and gives 85 Crafting XP, using Uncut ruby. Other sources include Earth impling, Earth impling jar, Thalassus and Dung kalphite, plus 3 more listed below. Making ten takes 10 × Uncut ruby and gives 850 Crafting XP. Reaching level 34 Crafting takes 20,224 XP in total; the Crafting calculator counts the actions and materials to any target, and the Crafting guide has the Ironman training route. 11 recipes use Ruby, including 'Lust' metal sculpture, 'Perfect' necklace and 'Perfect' ring. Ruby 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 600 coins, which is 400 less than the shop price, so buying it to alch does not pay.