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Radiant|Lab Grown|IGI

2.55ct F SI1 Radiant Lab Grown Diamond

ID • F/SI1 • IGI LG642456999

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

Certificate IGI LG642456999

Diamond specifications and retailer prices

From $2,060 USD
£1,622 GBP
As of November 2, 2026
Save $220 USD (10%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $2,280 USD at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 2.55ct lab-grown radiant diamond

This 2.55ct lab-grown radiant sits in the two to three carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG642456999 or 642456999. Listed at 2 retailers as of November 2, 2026, with a relatively tight 11% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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

2.55
Carat
F
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.8°
Pavilion angle35.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG642456999
Dimensions9.77 × 6.61 × 4.47 mm
L/W Ratio1.48
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.77 mm6.61 mm2.55 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG642456999
Side View
Table 65.0%Crown 43.8°Girdle: MediumPavilion 35.5°Culet: NoneDepth 67.6%

Caratlytics Score

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

Last verified: Nov 2
Current: $2,280 USD|Low: $283 USD|High: $3,800 USD|Avg: $1,351 USD|-7.7%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
April 14, 2026
Retailer 3$368 USD
Retailer 4$758 USD
Retailer 2$1,379 USD
Brilliant Earth$2,280 USD

32 data points across 4 retailers

2 retailers$2,060 USD to $2,280 USD

B+
Cheapest Retailer
-
$2,060 USD
£1,622 GBP
Most Expensive
B
Brilliant Earth
10913117Y · Nov 2
$2,280 USD
View
1 more retailer has this diamond
Prices start from $2,060 USDSave up to $220 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+
2.55ct Radiant
$2,060 USD