The Ruby Knight (The Elenium Trilogy, Book 2) by David Eddings
Book two of the classic ELENIUM trilogy. The quest for the jewel of life continues.
Time is running out for the poisoned Queen Ehlana. If she is to be saved Sparhawk must find the only cure - a powerful artefact called the Bhelliom - before it's too late.
But finding the rose-shaped sapphire is no simple task. No one has set eyes upon it since it was lost in the heat of a legendary battle.
To make matters worse, Sparhawk and his allies are not the only party questing to find the jewel.