Because of yellow pineapples and PURPLE MONKEYS IN SPACE
Depending on the intensity of the yellow colour (nitrogen) in the stone, the diamond could be 'called' by many names. Generally, visibly yellow diamonds can range from a 'light yellow' colour to an 'intense fancy yellow' colour. Canary diamond is another name given to some yellow diamonds. As well, 'colourless' diamonds graded from H through Z are also called 'yellow'. A certified gemologist can give you the exact name for the colour of the diamond in question.
Yello Brown
Yellow diamond has intense hues of yellow that look similar to gold; however, yellow diamond is not considered gold. The unique yellow color present in these diamonds is the result of the presence of nitrogen impurities which comes due to the composition of the crystal structure. Yellow diamonds are called Canary diamonds, sparkly and valuable pieces of lab-grown diamond jewelry. The nitrogen molecules in the diamond stone absorb the blue light, which makes the stone take a yellow hue. Yellow diamond stones differ from gold as they are fancy-colored diamonds depending on the nitrogen present. These diamonds can range from light yellow hue to bright, vivid, and more intense yellow hue.
If you mix yellow and black, you will get a darker shade of yellow called olive green or dark yellow. The black color would darken the yellow, resulting in a muted or earth-toned shade.
orpiment
The River is called The Yellow River because of the yellow silt that it carries throughout Northern China.
A young yellow jacket is called a larva
The "yellow dalek" is called the Eternal Dalek.
A male yellow jacket is called a drone.
The yellow river is called the yellow river
But they are called the yellow submarines.