The three words describe how hot the clay was fired, and that single difference determines nearly everything about how a piece behaves.
Firing Temperature Decides It
Earthenware is fired lowest. The clay stays porous, so it depends entirely on its glaze to be waterproof, and it chips readily.
Stoneware is fired considerably hotter, to the point where the clay body vitrifies and becomes largely non-porous in itself. It is denser, heavier and far more durable.
Porcelain is fired hottest, from a finer, whiter clay. It is the strongest for its thickness, which is why it can be made thin and translucent.
What That Means in Use
- Earthenware: lightest, cheapest, chips and stains most
- Stoneware: heavy, tough, tolerant of daily use and dishwashers
- Porcelain: strong, fine, more expensive, formal in appearance
- Stoneware and porcelain both suit everyday use
- Earthenware suits decorative and occasional pieces
Ranges offering both stoneware and porcelain, of the kind catalogued at https://famiware.net/, are offering two different weights and characters rather than two prices.
Weight Is the Clue
Picking a plate up tells you a great deal. Stoneware is noticeably heavy for its size. Porcelain of the same strength is lighter and thinner.
Earthenware feels light and slightly soft, and it sounds dull when tapped rather than ringing.
The Porosity Question
Why it matters practically. A porous body that gets water through a chip or a crack in the glaze will absorb it.
That water sits inside the piece, causes staining from within, and can expand in a microwave or a freezer and worsen the crack.
Vitrified stoneware and porcelain do not absorb, which is why a chip in either is cosmetic rather than the beginning of a failure.
Bone China Is Different Again
Porcelain with bone ash in the body, which makes it stronger and more translucent still, and more expensive.
None of Them Is Unbreakable
All three break when dropped on a hard floor.
Heavy Has a Cost
Stoneware is tiring for older hands and for a full cupboard shelf.
Check What You Are Buying
The word is usually in the listing, and it tells you most of what you need.
Check the Listing Wording
The body type is usually named, and where it is not, weight and price together are the practical clue.