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Round|Lab Grown|IGI

3.71ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG666401279

Shape and cutting style on the report: Round brilliant

Certificate IGI LG666401279

Diamond specifications and retailer prices

From £294 GBP
$394 USD
As of October 29, 2026
Save £1,217 GBP (81%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,511 GBP at Rare Carat · As of October 28, 2026
View at Rare Carat

About this 3.71ct lab-grown round diamond

This 3.71ct lab-grown round 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 LG666401279 or 666401279. Listed at 14 retailers as of October 28, 2026, with prices from £294 to £1,511, a £1,217 spread on the same certified stone. Rare Carat lists it at £1,511. 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

3.71
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.6°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG666401279
Dimensions9.93 × 9.97 × 6.08 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.93 mm9.97 mm3.71 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG666401279
Side View
Table 57.0%Crown 34.6°Girdle: MediumPavilion 40.7°Culet: NoneDepth 61.1%

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 29
Current: £1,920 GBP|Low: £294 GBP|High: £3,794 GBP|Avg: £1,108 GBP
Rare Carat
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 11£294 GBP
Retailer 6£329 GBP
Retailer 5£364 GBP
Retailer 15£401 GBP
Retailer 12£474 GBP
Retailer 10£488 GBP
Retailer 3£578 GBP
Retailer 13£580 GBP
Retailer 2£596 GBP
Retailer 14£615 GBP
Retailer 16£888 GBP
Retailer 9£1,022 GBP
Retailer 4£1,172 GBP
Rare Carat£1,920 GBP
Retailer 8£2,896 GBP
Retailer 7£3,794 GBP

5 data points across 16 retailers

14 retailers£294 GBP to £1,511 GBP

A
Cheapest Retailer
-
£294 GBP
$394 USD
A
Retailer 2
-
£329 GBP
$441 USD
View
A
Retailer 3
-
£364 GBP
$488 USD
View
A
Retailer 4
-
£401 GBP
HK$4,200 HKD
View
A
Retailer 5
-
£474 GBP
$635 USD
View
A
Retailer 6
-
£488 GBP
View
B+
Retailer 7
-
£578 GBP
$775 USD
View
A
Retailer 8
-
£580 GBP
€740 EUR
View
A
Retailer 9
-
£596 GBP
View
A
Retailer 10
-
£615 GBP
$824 USD
View
B+
Retailer 11
-
£888 GBP
$1,190 USD
View
B+
Retailer 12
-
£1,022 GBP
$1,370 USD
View
B+
Retailer 13
-
£1,172 GBP
$1,570 USD
View
Most Expensive
B
Rare Carat
KI2794012KF666 · Oct 28
£1,511 GBP
$2,025 USD
View
13 more retailers have this diamond
Prices start from £294 GBPSave up to £1,217 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
3.71ct Round
£294 GBP