In the grading process, what is the correct approach to masterstones relative to grading requirements?

In the grading process, what is the correct approach to masterstones relative to grading requirements?

• A. Masterstones should be matched to the color grading requirements
• B. Masterstones must be larger than the color grading set
• C. Masterstones must be kept uncalibrated at all times
• D. Masterstones are interchangeable without matching

Answer: (B)

Masterstones used in grading serve as reference standards that anchor the color reference scale and allow clear, repeatable comparisons during evaluation. Because you’re comparing a stone against fixed benchmarks, the size of the masterstones matters. They must be larger than the color grading stones in the set so they stay clearly visible and can be viewed with the same lighting and angles as the stone being assessed. This visibility helps prevent the master from being overwhelmed by the object under test and supports consistent judgments across sessions. Keeping masterstones calibrated and matched to the grading system is essential for accuracy, and they are not interchangeable without proper matching, nor should they be left uncalibrated.

Masterstones used in grading serve as reference standards that anchor the color reference scale and allow clear, repeatable comparisons during evaluation. Because you’re comparing a stone against fixed benchmarks, the size of the masterstones matters. They must be larger than the color grading stones in the set so they stay clearly visible and can be viewed with the same lighting and angles as the stone being assessed. This visibility helps prevent the master from being overwhelmed by the object under test and supports consistent judgments across sessions. Keeping masterstones calibrated and matched to the grading system is essential for accuracy, and they are not interchangeable without proper matching, nor should they be left uncalibrated.