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10.39ct G SI1 Round Lab Grown Diamond

EX • G/SI1 • IGI LG623420092

Shape and cutting style on the report: Round brilliant

Certificate IGI LG623420092

Diamond specifications and retailer prices

From £1,543 GBP
$2,067 USD
As of October 29, 2026
Save £8,257 GBP (84%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £9,799 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 10.39ct lab-grown round diamond

This 10.39ct lab-grown round 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 LG623420092 or 623420092. Listed at 18 retailers as of October 29, 2026, with prices from £1,543 to £9,799, a £8,257 spread on the same certified stone. Brilliant Earth lists it at £9,799. 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

10.39
Carat
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.5°
Pavilion angle40.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG623420092
Dimensions14.20 × 14.16 × 8.42 mm
L/W Ratio1.00
Girdle conditionFaceted
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
14.20 mm14.16 mm10.39 ctG / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG623420092
Side View
Table 58.0%Crown 32.5°Girdle: MED-STKPavilion 40.4°Culet: NoneDepth 59.4%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 29
Current: £9,799 GBP|Low: £1,481 GBP|High: £9,799 GBP|Avg: £2,691 GBP
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
Retailer 15
Retailer 16
October 31, 2026
Retailer 12£1,543 GBP
Retailer 11£1,601 GBP
Retailer 10£1,678 GBP
Retailer 5£1,727 GBP
Retailer 8£1,789 GBP
Retailer 13£1,789 GBP
Retailer 4£1,914 GBP
Retailer 7£2,158 GBP
Retailer 9£2,452 GBP
Retailer 15£2,459 GBP
Retailer 16£2,610 GBP
Retailer 3£2,797 GBP
Retailer 2£2,829 GBP
Retailer 6£5,088 GBP
Retailer 14£5,621 GBP
Brilliant Earth£9,799 GBP

42 data points across 16 retailers

18 retailers£1,543 GBP to £9,799 GBP

A
Cheapest Retailer
-
£1,543 GBP
$2,067 USD
A
Retailer 2
-
£1,601 GBP
View
A
Retailer 3
-
£1,678 GBP
$2,248 USD
View
A
Retailer 4
-
£1,727 GBP
$2,314 USD
View
Final sale: no returns
Retailer 5
-
£1,789 GBP
$2,397 USD
View
Price last confirmed 20 days ago
A
Retailer 6
-
£1,789 GBP
$2,397 USD
View
A
Retailer 7
-
£1,914 GBP
$2,565 USD
View
A
Retailer 8
-
£2,158 GBP
$2,891 USD
View
B+
Retailer 9
-
£2,452 GBP
View
B+
Retailer 10
-
£2,459 GBP
$3,295 USD
View
B+
Retailer 11
-
£2,610 GBP
$3,497 USD
View
Retailer 12
-
£2,797 GBP
$3,748 USD
View
Price last confirmed 13 days ago
B+
Retailer 13
-
£2,829 GBP
€3,610 EUR
View
Retailer 14
-
£4,649 GBP
$6,229 USD
View
Price last confirmed 38 days ago
B
Retailer 15
-
£5,088 GBP
$6,817 USD
View
B
Retailer 16
-
£5,621 GBP
$7,532 USD
View
B
Retailer 17
-
£6,258 GBP
$8,385 USD
View
Most Expensive
B
Brilliant Earth
20602535A · Oct 29
£9,799 GBP
$13,130 USD
View
17 more retailers have this diamond
Prices start from £1,543 GBPSave up to £8,257 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
10.39ct Round
£1,543 GBP