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Radiant|Lab Grown|IGI

4.07ct E SI1 Radiant Lab Grown Diamond

EX • E/SI1 • IGI LG640439977

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

Certificate IGI LG640439977

Diamond specifications and retailer prices

From £320 GBP
As of October 28, 2026
Save £2,826 GBP (90%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £3,146 GBP at Brilliant Earth · As of October 26, 2026
View at Brilliant Earth

About this 4.07ct lab-grown radiant diamond

This 4.07ct lab-grown radiant sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG640439977 or 640439977. Listed at 17 retailers as of October 26, 2026, with prices from £320 to £3,146, a £2,826 spread on the same certified stone. Brilliant Earth lists it at £3,146. 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

4.07
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.3°
Pavilion angle35.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG640439977
Dimensions11.22 × 7.94 × 5.37 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
11.22 mm7.94 mm4.07 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG640439977
Side View
Table 64.0%Crown 41.3°Girdle: MediumPavilion 35.5°Culet: NoneDepth 67.6%

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 28
Current: £3,146 GBP|Low: £320 GBP|High: £3,432 GBP|Avg: £1,000 GBP|-8.3%
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
October 28, 2026
Retailer 7£320 GBP
Retailer 3£345 GBP
Retailer 4£376 GBP
Retailer 8£381 GBP
Retailer 13£578 GBP
Retailer 14£604 GBP
Retailer 2£623 GBP
Retailer 12£654 GBP
Retailer 5£696 GBP
Retailer 6£1,041 GBP
Retailer 10£1,069 GBP
Retailer 9£1,492 GBP
Retailer 11£1,870 GBP
Brilliant Earth£3,146 GBP

36 data points across 14 retailers

17 retailers£320 GBP to £3,146 GBP

A
Cheapest Retailer
-
£320 GBP
Retailer 2
-
£345 GBP
$459 USD
View
Price last confirmed 32 days ago
Retailer 3
-
£376 GBP
$501 USD
View
Price last confirmed 32 days ago
Retailer 4
-
£381 GBP
$508 USD
View
Price last confirmed 18 days ago
A
Retailer 5
-
£381 GBP
$508 USD
View
A
Retailer 6
-
£578 GBP
$770 USD
View
B+
Retailer 7
-
£604 GBP
$804 USD
View
A
Retailer 8
-
£623 GBP
View
A
Retailer 9
-
£654 GBP
€829 EUR
View
A
Retailer 10
-
£696 GBP
$927 USD
View
B+
Retailer 11
-
£1,041 GBP
$1,386 USD
View
B+
Retailer 12
-
£1,069 GBP
$1,424 USD
View
B+
Retailer 13
-
£1,406 GBP
View
B+
Retailer 14
-
£1,492 GBP
View
B
Retailer 15
-
£1,870 GBP
$2,490 USD
View
Retailer 16
-
£1,877 GBP
$2,500 USD
View
Price last confirmed 30 days ago
Most Expensive
B
Brilliant Earth
10979854A · Oct 26
£3,146 GBP
$4,190 USD
View
16 more retailers have this diamond
Prices start from £320 GBPSave up to £2,826 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
4.07ct Radiant
£320 GBP