Get this riddle!

[Oli-Ranteu]

Ok,a week for anybody to attempt to solve this simple riddle:

A poem was written by a poor man and he offered a prize to anybody who could solve it,the hand in marriage of his lovely daughter.

This was the poem:

--A round stone,glinting in the light
-An ultimate power,the key to your plight
-A tub of poison,guarding the precious
-For your eyes this is fatal.
------------------------
This was a poem about the stone in the wedding ring he offered for the person who cracked the code and would be married by that ring.

The question is,what type of jewel was he on about?!?!?!?!?!?

[Oli-Ranteu]

Come on people,nobody gonna play?
right,if nobody is gonna play,Im gonna make something different that will hopefully catch everyones eye.

[Dev]

Emerald?


Philosopher stone?

[Megafrost]

Look, this board doesn't get much traffic these days. Do you really expect your contest to have loads and loads of guesses? Don't get frustrated because no one is around to respond to your contest. The contest is one week long and you're getting uptight after just 14 hours?

Also, triple-posting is bad.