grainer An old style term used to describe carat weight in 1/4 carat increments. A two grainer is a 1/2 carat, a 3 grainer is a 3/4 carat, etc.
Four Grainer
Point
Clarity
A stone's relative position on a flawless to imperfect scale. Clarity characteristics are classified as inclusions (internal) or blemishes (external).
Four grainer: See Grainer.
Full-cut brilliant: A brilliant-cut diamond or colored stone with the usual total of 58 facets. See Ideal-cut.
G Top ...
A one-carater therefore is also a four-grainer. The term "one-carater" does not only refer to a diamond of exactly 1.00 ct, but comprises diamonds within a certain weight zone, which can be described as follows:
one-carater (four-grainer)
0.95-1.
A quarter carat (approximately) diamond. A two-grainer would weight about a half carat, a three-grainer about 0.75 carats, and a four-grainer about one carat, etc.
Graining ...
25 points or 1/4ct.; A diamond of approximately 1ct. would be called a 4 grainer, one ~ 1.5ct. would be a 6 grainer, and a 0.5ct. stone a 2 grainer.
Melee ...
After the adoption of the 200mg carat, the decimal standard came into use. In the trade, a one carat gemstone, specifically the diamond, is still referred to as a 'four grainer', and the 0.75 carat diamond as the 'three grainer'.
In contrast, Asian markets used grains of rice to measure their goods and you may still hear some jewelers refer to a single carat diamond as a "four grainer" since one carat was once considered to be equal to the weight of four grains of rice.
 See also: Clarity, Stone, Size, Shape, Cut
  
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