Which statement about electronic scales is correct in gemstone practice?

• A. They are extremely accurate, but they must be set up correctly for best results.
• B. They are inherently inaccurate and unreliable.
• C. They do not require calibration or maintenance.
• D. They work without any setup or reference standards.

Answer: (A)

Electronic scales can provide highly precise measurements, which gemstone practice relies on for accurate carat determination. That precision, however, only shows up when the scale is set up correctly and regularly calibrated. A properly set up scale sits on a level, stable surface and is protected from drafts, vibrations, and temperature changes. Before weighing, you zero or tare the scale to remove any previous weight, then weigh using calibration weights that are traceable to recognized standards to verify and adjust the reading. Regular maintenance and periodic recalibration keep the instrument accurate over time. The other statements overlook these essential steps—without setup, calibration, and reference standards, the readings can drift or be unreliable.