The number of masters in your set will depend on your needs and perhaps your budget. It’s a good idea to begin by spreading them out, collecting for example an “E”, an “H”, and an “I”. This will give you… Continue reading
Master stones lined up in a grading tray with the whitest to the left and darkest to the right.In using masters, arrange them in your color grading tray with the whitest to the left and the darker to the right.… Continue reading
If dealing in fancy yellows, a Z color would be a great addition to your set. Anything lower than Z would be at least a Light Fancy Color.
CZ (Cubic Zirconia) masters are ok to begin with, but are not recommended for long-term use or for more expensive trading. It has been said that they darken over time, from which you could imagine the potential harm that could… Continue reading
Lighting will be a critical factor in grading color accurately. Negative factors in lighting and environment would include bright surrounding colors, dim light or direct sunlight. Ideal conditions would include neutral colored surroundings and natural daylight away from direct sunlight.… Continue reading
It’s always a good idea to think about your state of alertness concerning your eyes and mind. Mistakes are easily made after hours of grading or mental effort of any kind. Make sure the color grading tray is a non-fluorescent… Continue reading
The first step in grading color in loose diamonds is to clean the stone in question.
The human eye is not always going to be 100% accurate in discerning slight color differences. Color blindness, (much more common in males), is a definite disadvantage, but some graders have learned to compensate for it.
A typical inaccuracy in human sight is the left-right deviation (also known as “The Master Eye Effect”). Generally one eye is stronger than the other creating a slight color deviation in one’s perception. A stone placed to the left will… Continue reading
Light brown diamonds often face up much whiter than their yellow counterparts.Many graders insist that the brown hues require the background light provided by the GIA Diamond Lite. The very slight tints of brown that often face-up (seen crown-up) as… Continue reading
Many dealers and gemologists insist that several grading positions (color viewing directions) are imperative. On a round brilliant, the color concentration has a tendency to lie near the culet of the diamond. In elongated fancy shapes, the color has a tendency to favor the ends of the shape. Continue reading
Colorimeters — manufactured by three different companies — were designed to replace or perhaps enhance color-grading master stones by using a fiber- optic light system to digitally measure the color of a diamond. The accuracy is claimed to be within… Continue reading