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Radiant|Lab Grown|IGI

1.21ct E SI1 Radiant Lab Grown Diamond

VG • E/SI1 • IGI LG478127998

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG478127998

Diamond specifications and retailer prices

From $391 USD
As of November 6, 2026
2 retailers carry this diamond
Most expensive: $1,165 USD at MOH London · As of October 29, 2026
View at MOH London

About this 1.21ct lab-grown radiant diamond

This 1.21ct lab-grown radiant sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG478127998 or 478127998. Listed at 2 retailers as of November 6, 2026. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.21
Carat
E
Color
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LG478127998
Dimensions7.38 × 5.26 × 3.75 mm
L/W Ratio1.40
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) process.
Top View
7.38 mm5.26 mm1.21 ctE / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG478127998
Side View
Table 60.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 71.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 6
Current: $1,165 USD|Low: $372 USD|High: $1,172 USD|Avg: $609 USD|-0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 4, 2026
Retailer 2$391 USD
Retailer 6$416 USD
Retailer 4$431 USD
Retailer 5$517 USD
Retailer 3$782 USD
MOH London$1,165 USD

11 data points across 6 retailers

2 retailers

B+
Cheapest Retailer
-
$391 USD
Most Expensive
MOH London
LG478127998 · Oct 29
$1,165 USD
£917 GBP
View
Price last confirmed 8 days ago
1 more retailer has this diamond
Prices start from $391 USD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

B+
1.21ct Radiant
$391 USD