Judo in Canada Canada there are six "kyū" grades for seniors (people 16 years of age or older), eleven "kyū" grades for juniors (people under the age of 16), and ten "dan" grades that are restricted to seniors. Both senior and junior students begin as white belts ("rokkyū") and progress with promotion through yellow, orange, green, and blue, to brown belt ("ikkyū"). Half-grades for juniors were introduced in 2010 and are represented by belts that combine the colours of the previous grade and the next grade (a white and yellow belt, for example, represents a half-grade between "rokkyū" and "gokyū", which the grading
Diamond color Gemological Institute of America's scale are valued according to their clarity and color. For example, a "D" or "E" rated diamond (both grades are considered colorless) is much more valuable than an "R" or "Y" rated diamond (light yellow or brown). This is due to two effects: high-color diamonds are rarer, limiting supply; and the bright white appearance of high-color diamonds is more desired by consumers, increasing demand. Poor color is usually not enough to eliminate the use of diamond as a gemstone: if other gemological characteristics of a stone are good, a low-color diamond can remain more valuable as