Originally Posted by
El Presidente Woona
Round I start, yet no shape have I.
A grain of sand doesn't have a particular shape, but is generally considered round.
Allow me to breathe, and my life will die.
Clams live underwater.
The older I grow, the more sought after I become.
When a grain of sand gets stuck in an oyster or clam (I forget which), layers of some sort of enamel are applied to it, the longer it spends inside the shellfish, the bigger it gets, the more valuable it will be. Thanks for pointing it out though.
You will feel much better when I am done.
I presume it's not pleasant to have a pearl growing inside of you (poor clam)
What am I?
A pearl.