Kbadkar,
It IS an egg-chess set! We are the egg-family (family joke). I'm not sure what material the chess pieces are made of, but they are impressively heavy. A "Targette" special!
Once I decided against a natural rough plateau bottom, I wanted to accent the birdseye, but still have a nice hand-feel. And I thought the rounded bottom would be interesting.

The "ivory" is cheap-ass fake ivory, nothing special. Thanks for the comments!