Your guide to lab-grown diamonds.

Certification and Verification

Guides/Certification and Verification Certification and Verification How to read a laboratory-grown diamond report, and check it yourself LG000000000 An IGI report notes growth p...

What a Large Stone Actually Costs, and Why Price per Carat Falls

  Guides/Price per Carat What a Large Stone Actually Costs, and Why Price per Carat Falls Listings checked September 18, 2026 1 ct 3 ct 5 ct 10 ct In laboratory-grown diamonds, pri...

What to Ask Any Seller Before Buying Above Five Carats

  Guides/Questions to Ask What to Ask Any Seller Before Buying Above Five Carats Eleven questions, and what good and bad answers sound like 11 ? ? ? ? ? ? ? ? ? ? ? Ask whether the stone...

Diamond type, and What "Type IIa" Actually Tells You

  Guides/Diamond Type Diamond Type, and What “Type IIa” Actually Tells You A classification by chemistry, not a quality grade ...

How Fancy Colors Are Produced

Guides/Fancy Colors How Fancy Colors Are Produced Grown in, or added after: two routes to a colored laboratory-grown diamond Most colored laboratory-grown diamonds get their color aft...

Why Cut Is the Hard Part at This Size

Guides/Why Cut Is the Hard Part Why Cut Is the Hard Part at This Size Every lab-grown size record above 30 carats has been an emerald cut CVD crystals grow wide rather than deep — ...

IGI vs GIA for Laboratory-Grown Diamonds

  Guides/IGI vs. GIA for Lab-Grown Diamonds IGI vs. GIA for Lab-Grown Diamonds Reflects GIA's policy effective October 1, 2025 For laboratory-grown diamonds, the old comparison bet...

How Large Lab-Grown Diamonds Are Actually Made

  Guides/How Large Lab-Grown Diamonds Are Made How Large Lab-Grown Diamonds Are Actually Made Current record: 75.33 carats, certified by IGI in May 2024 The largest polishe...