Are Colar CVD lab-grown diamonds chemically identical to mined diamonds?

Yes, Colar CVD lab-grown diamonds possess the exact same chemical composition, optical brilliance, and isometric crystal structure (Type IIa) as mined natural diamonds.

Do Colar lab-grown diamonds carry IGI and GIA certification?

All Colar wholesale lab-grown diamonds are independently graded and certified by international gemological institutes such as IGI and GIA with laser girdle inscriptions.

Where is Colar Diamond's manufacturing facility located?

Our state-of-the-art CVD growth reactors and lapidary diamond cutting facilities are located in Surat, Gujarat, India.

Home/Insights/What Makes a 3EX Diamond? Excellent Cut, Polish & Symmetry Demystified

CraftsmanshipJuly 22, 2026• 6 min read

What Makes a 3EX Diamond? Excellent Cut, Polish & Symmetry Demystified

Understanding the triple excellent grading threshold that unlocks maximum light return, scintillation, and premium market valuation.

Colar Lapidary TeamPrecision Cutters & Quality Assurance

What Makes a 3EX Diamond? Excellent Cut, Polish & Symmetry Demystified

Key Executive Takeaways

3EX refers to diamonds graded Excellent in Cut Grade, Polish, and Symmetry by IGI or GIA.
Perfect symmetry prevents optical distortion and misaligned facet junctions that cause light leakage.
Microscopic polishing eliminates surface drag lines, ensuring frictionless light reflection.

1. The Three Pillars of 3EX Grading

Achieving a 3EX certificate rating requires microscopic precision at every stage of diamond polishing:

Cut Grade: Evaluates proportions, table percentage, depth percentage, and crown/pavilion angles.
Polish: Measures surface smoothness and freedom from polishing wheel drag lines or burn marks.
Symmetry: Assesses alignment of crown and pavilion facets, table centering, and girdle uniformity.

Article Tags:#3EX Cut#Excellent Polish#Excellent Symmetry#Diamond Fire#Gemology

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