DCA Gemology Practice Test

What table width is commonly cited as ideal for a round brilliant cut diamond?

54% to 57% 53% to 57% 63% to 67% 50% to 52%

Correct Answer:

53% to 57%

Explanation:

Table width, expressed as a percentage of the diamond’s diameter, is a key factor in how light travels inside a round brilliant. If the table is too wide, more light escapes upward, reducing light return and making the gem appear less brilliant and lively. If the table is too narrow, light entry is restricted and some facets can darken, also dulling overall brightness. The commonly cited ideal range, about 53% to 57%, strikes a balance: it gives a pleasing face-up view while allowing enough interaction of light with the crown and pavilion facets to maximize brilliance and fire. In practice, you’ll see many well-cut rounds with tables in this middle band, producing strong light performance without the trade-offs that come with tables that are too large or too small.

Access more questions from this quiz

Continue to DCA Gemology Practice Test for more practice questions and the full quiz experience.

Access More Questions