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Round|Lab Grown|IGI

8.51ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG588335479

Shape and cutting style on the report: Round brilliant

Certificate IGI LG588335479

Diamond specifications and retailer prices

From £1,103 GBP
$1,480 USD
As of November 2, 2026
Save £3,510 GBP (76%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £4,613 GBP at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 8.51ct lab-grown round diamond

This 8.51ct lab-grown round sits in the over five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG588335479 or 588335479. Listed at 13 retailers as of November 2, 2026, with prices from £1,103 to £4,613, a £3,510 spread on the same certified stone. Brilliant Earth lists it at £4,613. 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

8.51
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.6°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG588335479
Dimensions13.05 × 12.98 × 8.12 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
HEARTS & ARROWS This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
13.05 mm12.98 mm8.51 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG588335479
Side View
Table 58.0%Crown 35.6°Girdle: MediumPavilion 41°Culet: NoneDepth 62.3%

Caratlytics Score

How it works →
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 2
Current: £4,613 GBP|Low: £972 GBP|High: £5,708 GBP|Avg: £2,110 GBP|-19.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 2, 2026
Retailer 9£972 GBP
Retailer 5£1,103 GBP
Retailer 7£1,381 GBP
Retailer 3£1,404 GBP
Retailer 6£1,546 GBP
Retailer 2£1,648 GBP
Retailer 10£1,915 GBP
Retailer 8£2,827 GBP
Retailer 4£3,123 GBP
Brilliant Earth£4,613 GBP

36 data points across 10 retailers

13 retailers£1,103 GBP to £4,613 GBP

Retailer 1
-
£838 GBP
$1,124 USD
Price last confirmed 40 days ago
Retailer 2
-
£911 GBP
$1,223 USD
View
Price last confirmed 40 days ago
Retailer 3
-
£958 GBP
$1,286 USD
View
Price last confirmed 36 days ago
A
Retailer 4
-
£1,103 GBP
$1,480 USD
View
B+
Retailer 5
-
£1,381 GBP
$1,853 USD
View
B+
Retailer 6
-
£1,404 GBP
View
B+
Retailer 7
-
£1,546 GBP
$2,075 USD
View
B+
Retailer 8
-
£1,648 GBP
€2,106 EUR
View
Retailer 9
-
£1,822 GBP
$2,445 USD
View
Price last confirmed 36 days ago
B+
Retailer 10
-
£1,915 GBP
$2,570 USD
View
B
Retailer 11
-
£2,827 GBP
$3,793 USD
View
B
Retailer 12
-
£3,123 GBP
View
Most Expensive
B
Brilliant Earth
7646058A · Nov 2
£4,613 GBP
$6,190 USD
View
12 more retailers have this diamond
Prices start from £1,103 GBPSave up to £3,510 GBP

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
8.51ct Round
£1,103 GBP