Microwave oven and dishwasher   safe.
Made in England.
Several processes are involved in the making of   bone china, but the ingredient that sets it apart from porcelain is   that bone ash is added during the manufacturing of the piece. This makes the piece lighter and more translucent than porcelain. 
The   processing of bone china is more elaborate and more expensive than   other types of china, so the price is reflective of this more extensive   process. This process also gives 
bone china  mugs and 
teacups   their thin rims and makes sipping a cup of tea more enjoyable. It is easy to tell if your piece is bone china  or porcelain.   Simple hold it up to the light and it will have a white,  translucent   look if it is bone china.  
Bone china undergoes two firing processes. The first makes the   product shrink causing about 20% of the pieces to break. The second   firing happens after the piece is   glazed to melt the glaze onto the piece. Those that do not crack or   break during this stage are decorated with their final patterns.   The decoration can be  hand painted, sprayed or decals are applied. Many   pieces have gold, silvered, or colored paint applied to the rim.