The Rice Grain Pattern and how it is made...
The term "rice grain" is misleading, there are no grains in there. The western name for this pattern comes possibly from the translucent grain shape used in the pattern.
This is pattern was made at least since the early 19th century, and it is still being manufactured today. It is found mainly on dishes, bowls, spoons or cups, but not on larger items, usually.
How it is made...
A porcelain item with a finished shape has the grain-shaped pattern cut into the clay, making there an empty space.
Later, when the surface of the item is covered with glaze, it fills the cut out shapes. The rest of the decoration is completed as usual. The fired item has now pattern with translucent grain-like shapes.