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GCAL 8X® Ultimate Cut Grade Lab-Grown Diamonds

Ultimate Cut Grade: Extraordinarily Brilliant and Beautiful

  • Lab-grown diamonds achieve excellent grades in all eight aspects of cut quality
  • An interactive GCAL Grading Certificate that includes videos and more. See example here.

Ultimate Diamond Cut Grade

8X® Lab-Grown Diamonds are awarded the highest achievement in precision diamond cutting. Recognized for their extraordinary brilliance and beauty, these lab-grown diamonds are meticulously analyzed and ultimately certified to be physically and optically excellent in eight critical factors of cut quality.

8X Diamonds logo

Cut Grade

  1. Polish Excellent
  2. External Symmetry Excellent
  3. Proportions Excellent
  4. Optical Brilliance Excellent
  5. Fire Excellent
  6. Scintillation Excellent
  7. Optical Symmetry Excellent
  8. Hearts & Arrows Excellent

Physical Excellence

The first three of the 8X grading factors analyze the exactness of the physical surface, the facet shapes, as well as the angles.

Riente Diamonds facets


Skill and time are required to produce a well-polished diamond. GCAL gemologists examine every facet to ensure it is free of polish marks, burns, and scratches.

Riente Diamonds facets

External Symmetry

Master cutters identically shape each facet around the lab-grown diamond and ensure they are perfectly aligned.


Optical scanning technology measures each facet and angle to produce an accurate, to-scale diagram of every diamond.

Table %

54.0% to 58.0%

Depth %

59.8% to 62.2%

Crown Angle

34.0º to 35.0°

Pavilion Angle

40.6° to 41.0°

Star Length

45% to 55%

Culet Size

None to Very Small

Girdle Thickness

Thin to Slightly Thick, Faceted

Lower Girdle Facet

75% to 80%

Lab-Grown Diamond

Every Lab-Grown Diamond sold with a report includes these benefits

ID Number Security
Laser inscribed number offers the ultimate safeguard.
Easy Reviews and Returns
Qualified accounts enjoy 5 day reviews and pre-paid returns.
Personalized Inscription
Engrave a personal message for as little as $25.00. Call 800-877-7777 and press 5 for details.
Buy with Confidence
All Lab-Grown Diamonds are hand selected and individually graded.
3/1/2024 Market Prices:
Gold 2049.80 Platinum 879.00 Silver 22.72