The ruby ring is intensely magical, but you are wise enough not to put it on your finger. Even when it is just being carried, it will halve your Luck while doubling your Constitution. It has other powers also, but only a high level wizard would be able to determine them. Anyone who has it for more than a few days will begin to have an intense craving for blood, and experience terrible nightmares. The value is 3000 gold pieces, and you are advised to sell it quickly, as it is not a healthy or safe ring to own. But, for now, let the character put it in his treasure pouch.
You can still extract the silver stake (fool!),
or try to get a closer look at the box,
or get out of this room quickly and return to the intersection.