Skip to content

Lab Grading

Every Black by Brian Gavin diamond is graded “0” for cut, polish, symmetry, and—most importantly, light performance—by the American Gem Society Laboratory (AGSL), a lab known for its strict grading standards and scientific evaluation of light performance. But we take it a step further. Our criteria for which diamonds can become a Black by Brian Gavin diamond are even more exacting.

Our Black by Brian Gavin standards include:

  • Color rating of D–G

  • Clarity rating of IF–VS2

  • Impeccable indexed symmetry

  • Precise Hearts and Arrows patterning

  • The Gavin Effect - Optimized secondary angles for an exacting ASET image

This means with every Black by Brian Gavin, you are truly receiving the upper echelon of the world’s finest diamonds.

Why Lab Grading Matters

Almost any diamond will look impressive under the bright spotlights of a jewelry store, but only a rare few hold their brilliance in more natural lighting situations—and better still—in strict grading environments.

Next Insurance