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Radiant|Lab Grown|IGI

3.09ct D SI1 Radiant Lab Grown Diamond

ID • D/SI1 • IGI LG710539520

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

Certificate IGI LG710539520

Diamond specifications and retailer prices

From £265 GBP
$355 USD
As of October 30, 2026
Save £2,862 GBP (92%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £3,127 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 3.09ct lab-grown radiant diamond

This 3.09ct lab-grown radiant sits in the three to five carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG710539520 or 710539520. Listed at 19 retailers as of October 30, 2026, with prices from £265 to £3,127, a £2,862 spread on the same certified stone. Brilliant Earth lists it at £3,127. 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

3.09
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.1°
Pavilion angle36.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG710539520
Dimensions10.16 × 7.19 × 4.99 mm
L/W Ratio1.41
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.16 mm7.19 mm3.09 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG710539520
Side View
Table 67.0%Crown 43.1°Girdle: MED-STKPavilion 36.2°Culet: NoneDepth 69.4%

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: Oct 30
Current: £3,127 GBP|Low: £247 GBP|High: £3,612 GBP|Avg: £887 GBP|-13.4%
Brilliant Earth
Retailer 2
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Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
October 31, 2026
Retailer 14£265 GBP
Retailer 10£296 GBP
Retailer 5£307 GBP
Retailer 6£328 GBP
Retailer 16£328 GBP
Retailer 4£440 GBP
Retailer 15£449 GBP
Retailer 13£496 GBP
Retailer 7£565 GBP
Retailer 2£576 GBP
Retailer 12£591 GBP
Retailer 3£962 GBP
Retailer 18£1,055 GBP
Retailer 11£1,085 GBP
Retailer 9£1,161 GBP
Retailer 8£1,259 GBP
Retailer 17£1,289 GBP
Retailer 19£1,862 GBP
Brilliant Earth£3,127 GBP

32 data points across 19 retailers

19 retailers£265 GBP to £3,127 GBP

A
Cheapest Retailer
-
£265 GBP
$355 USD
A
Retailer 2
-
£296 GBP
$396 USD
View
Final sale: no returns
A
Retailer 3
-
£307 GBP
$411 USD
View
A
Retailer 4
-
£328 GBP
$440 USD
View
A
Retailer 5
-
£328 GBP
$440 USD
View
B+
Retailer 6
-
£440 GBP
$590 USD
View
A
Retailer 7
-
£449 GBP
View
A
Retailer 8
-
£496 GBP
$665 USD
View
A
Retailer 9
-
£565 GBP
$757 USD
View
Retailer 10
-
£576 GBP
€735 EUR
View
A
Retailer 11
-
£591 GBP
View
B+
Retailer 12
-
£962 GBP
$1,289 USD
View
B+
Retailer 13
-
£1,055 GBP
$1,413 USD
View
B+
Retailer 14
-
£1,085 GBP
$1,454 USD
View
B
Retailer 15
-
£1,161 GBP
$1,556 USD
View
B+
Retailer 16
-
£1,259 GBP
$1,687 USD
View
B+
Retailer 17
-
£1,289 GBP
View
B
Retailer 18
-
£1,862 GBP
$2,495 USD
View
Most Expensive
B
Brilliant Earth
16226177A · Oct 30
£3,127 GBP
$4,190 USD
View
18 more retailers have this diamond
Prices start from £265 GBPSave up to £2,862 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
3.09ct Radiant
£265 GBP