What Is an 8X Cut Diamond ?

An 8X lab grown diamond is assessed under GCAL’s 8X standard, which evaluates eight aspects of cut quality. These factors cover physical cut precision, light performance, and the optical alignment and appearance of a diamond’s facets.

The eight GCAL 8X assessment factors can be grouped into three areas:

• Physical precision: Polish, external symmetry, and proportions
• Light performance: Brilliance, fire, and scintillation
• Optical quality: Optical symmetry and shape aesthetics

Proportions include measurements such as table percentage, depth percentage, crown angle, and pavilion angle. Star length and lower-half facet length also describe aspects of a diamond’s geometry. Together, these factors help shoppers evaluate cut quality beyond carat weight alone.

For a closer look at how the standard works, read our guide to 8X Cut Diamonds at Ouros Jewels.

How to Choose an 8X Lab Grown Diamond

An 8X assessment can help shoppers examine a diamond’s cut precision and documented light performance. Brightness describes the return of white light, fire refers to flashes of spectral color, and scintillation describes the changing sparkle seen as a diamond or viewing angle moves. These effects can vary with the individual stone and viewing conditions, so the assessment should be considered alongside the diamond’s actual appearance and supporting documentation.

Certification is another factor to consider when comparing loose lab grown diamonds. GIA and IGI reports provide grading information, while GCAL’s 8X assessment focuses on cut quality and light performance. If you want to understand the differences between grading laboratories and their reports, read our guide to IGI vs. GIA vs. GCAL diamond certification.

Choose the diamond that fits your priorities, whether that means a particular shape, size, or documented cut assessment. Explore our Hand-Picked Diamonds for another selection of loose diamonds