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Radiant|Lab Grown|IGI

1.09ct G SI1 Radiant Lab Grown Diamond

EX • G/SI1 • IGI LG640421133

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

Certificate IGI LG640421133

Diamond specifications and retailer prices

From $415 USD
£327 GBP
As of November 2, 2026
Save $64 USD (13%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $479 USD at MD Diamonds and Jewellers · As of November 2, 2026
View at MD Diamonds and Jewellers

About this 1.09ct lab-grown radiant diamond

This 1.09ct lab-grown radiant sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG640421133 or 640421133. Listed at 2 retailers as of November 2, 2026, with prices from $415 to $479, a $64 spread on the same certified stone. MD Diamonds and Jewellers lists it at $479. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.09
Carat
G
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44°
Pavilion angle36.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG640421133
Dimensions7.05 × 5.20 × 3.49 mm
L/W Ratio1.36
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.05 mm5.20 mm1.09 ctG / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG640421133
Side View
Table 68.0%Crown 44°Girdle: MediumPavilion 36.2°Culet: NoneDepth 67.1%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 2
Current: $479 USD|Low: $415 USD|High: $479 USD|Avg: $466 USD
MD Diamonds and Jewellers
Retailer 2
September 26, 2026
Retailer 2$415 USD
MD Diamonds and Jewellers$479 USD

4 data points across 2 retailers

2 retailers$415 USD to $479 USD

B+
Cheapest Retailer
-
$415 USD
£327 GBP
Most Expensive
B+
MD Diamonds and Jewellers
LG640421133 · Nov 2
$479 USD
£377 GBP
View
1 more retailer has this diamond
Prices start from $415 USDSave up to $64 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+
1.09ct Radiant
$415 USD