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Radiant|Lab Grown|IGI

5.51ct G SI1 Radiant Lab Grown Diamond

ID • G/SI1 • IGI LG587327382

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

Certificate IGI LG587327382

Diamond specifications and retailer prices

From $822 USD
As of November 1, 2026
Save $2,938 USD (78%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $3,760 USD at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 5.51ct lab-grown radiant diamond

This 5.51ct lab-grown radiant sits in the over five carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG587327382 or 587327382. Listed at 18 retailers as of November 1, 2026, with prices from $822 to $3,760, a $2,938 spread on the same certified stone. Brilliant Earth lists it at $3,760. 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

5.51
Carat
G
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle45°
Pavilion angle31.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG587327382
Dimensions11.96 × 8.49 × 5.76 mm
L/W Ratio1.41
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
11.96 mm8.49 mm5.51 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG587327382
Side View
Table 72.0%Crown 45°Girdle: STK-THKPavilion 31.1°Culet: NoneDepth 67.8%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $3,760 USD|Low: $706 USD|High: $7,100 USD|Avg: $1,755 USD|-47.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
November 2, 2026
Retailer 12$735 USD
Retailer 4$800 USD
Retailer 6$822 USD
Retailer 13$852 USD
Retailer 11$1,030 USD
Retailer 5$1,326 USD
Retailer 9$1,353 USD
Retailer 7$1,368 USD
Retailer 3$1,382 USD
Retailer 2$1,857 USD
Retailer 10$2,252 USD
Retailer 14$2,397 USD
Retailer 8$3,348 USD
Brilliant Earth$3,760 USD

41 data points across 14 retailers

18 retailers$822 USD to $3,760 USD

Retailer 1
-
$735 USD
Price last confirmed 12 days ago
Retailer 2
-
$800 USD
View
Price last confirmed 13 days ago
A
Retailer 3
-
$822 USD
View
Final sale: no returns
Retailer 4
-
$852 USD
View
Price last confirmed 11 days ago
Retailer 5
-
$852 USD
View
Price last confirmed 21 days ago
A
Retailer 6
-
$1,030 USD
View
B+
Retailer 7
-
$1,326 USD
View
B+
Retailer 8
-
$1,353 USD
€1,289 EUR
View
B+
Retailer 9
-
$1,368 USD
£1,077 GBP
View
B+
Retailer 10
-
$1,382 USD
View
B+
Retailer 11
-
$1,857 USD
View
B
Retailer 12
-
$2,252 USD
View
Retailer 13
-
$2,397 USD
View
Price last confirmed 11 days ago
B
Retailer 14
-
$2,766 USD
View
B
Retailer 15
-
$2,938 USD
View
Retailer 16
-
$3,310 USD
View
Price last confirmed 40 days ago
B
Retailer 17
-
$3,348 USD
£2,636 GBP
View
Most Expensive
B
Brilliant Earth
7657936A · Nov 2
$3,760 USD
View
17 more retailers have this diamond
Prices start from $822 USDSave up to $2,938 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.

A
5.51ct Radiant
$822 USD