Diamond color grading evaluates how closely a diamond approaches pure colorlessness. In gemological laboratories, stones are graded face-down (table down) against a neutral white background under calibrated daylight-equivalent lighting (5500K to 6500K color temperature), comparing the stone against pre-certified "master color stones":
Two diamonds with the exact same certified "F" color grade can look noticeably different to a trained buyer. This is because standard 4Cs color grading measures saturation of tint, but not necessarily its specific hue (undertone):
At Lavish, our quality assurance protocols reject stones with visible brown, gray, or muddy undertones, ensuring only clean, crisp icy crystals enter inventory.
Clarity grading evaluates internal inclusions and external blemishes under 10x magnification. In lab-grown diamonds, common inclusion types include:
Microscopic dots of non-diamond carbon or tiny vacancy clusters. Isolated pinpoints are virtually imperceptible; dense clouds can cause slight localized haziness.
Exclusive to HPHT synthesis. Sub-microscopic droplets of iron, nickel, or cobalt alloy trapped as the crystal solidified. Appear as small reflective metallic crystals.
Microscopic internal cleavage cracks along the {111} crystallographic planes. Small feathers located away from the girdle have zero structural impact.
Subtle planar boundaries formed during cyclical vapor pulsing in CVD reactors, creating internal strain patterns visible under polarized filters.
In fine jewelry manufacturing, the golden rule of diamond selection is "Eye-Clean". A diamond is certified eye-clean when a person with 20/20 vision, viewing the diamond face-up at a standard viewing distance of 10 to 12 inches under diffused daylight, cannot detect any visible inclusions.
Virtually 100% of VVS1, VVS2, and VS1 lab-grown diamonds are guaranteed eye-clean. Approximately 95% of VS2 stones are eye-clean, making VS2 the premier commercial value tier in wholesale diamond buying. In SI1 stones, eye-clean status depends on the location and color of the inclusion (e.g., a white pinpoint hidden under crown facets is eye-clean, whereas a dark inclusion dead-center on the table facet is not).
The universal language of diamond quality is the 4Cs—Cut, Color, Clarity, and Carat Weight. Established by the GIA and adopted globally by IGI, the 4Cs apply with equal scientific rigor to lab-grown diamonds, governing both visual brilliance and wholesale commercial value.
A diamond is an intricate optical prism. When light enters a diamond cut with mathematically ideal proportions, total internal reflection directs 100% of light back through the crown to the viewer’s eye, generating maximum fire and brilliance.
The International Gemological Institute (IGI) is the global gold standard for lab-grown diamond certification. This comprehensive guide walks you through every data field on an official IGI report—from 4Cs grading to proportion diagrams and vital growth comments.