Which term is a transparent measuring device used to measure a diamond's table, divided into millimeters and tenths?

Which term is a transparent measuring device used to measure a diamond's table, divided into millimeters and tenths?

• A. Table gauge
• B. Tang
• C. Tetrahedron
• D. Thermal conductivity

Answer: (A)

Measuring the diamond’s table relies on the diameter of that flat top facet. The transparent table gauge is a clear ruler-like tool marked in millimeters with tenths, designed to span the table so you can read its width precisely. You place the gauge across the table and read the measurement to 0.1 mm. This precise table size matters because it influences how light travels through the diamond, affecting brilliance and overall cut balance. The other terms don’t fit: a tang isn’t a transparent ruler for measuring the table, a tetrahedron is a crystal shape, and thermal conductivity relates to how a diamond tester detects a gem, not to measuring the table.

Measuring the diamond’s table relies on the diameter of that flat top facet. The transparent table gauge is a clear ruler-like tool marked in millimeters with tenths, designed to span the table so you can read its width precisely. You place the gauge across the table and read the measurement to 0.1 mm. This precise table size matters because it influences how light travels through the diamond, affecting brilliance and overall cut balance. The other terms don’t fit: a tang isn’t a transparent ruler for measuring the table, a tetrahedron is a crystal shape, and thermal conductivity relates to how a diamond tester detects a gem, not to measuring the table.