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Round|Lab Grown|IGI

3.71ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG639459451

Shape and cutting style on the report: Round brilliant

Certificate IGI LG639459451

Diamond specifications and retailer prices

From £988 GBP
CA$1,838 CAD
As of October 30, 2026
Save £319 GBP (24%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £1,307 GBP at The Diamond Guys · As of October 30, 2026
View at The Diamond Guys

About this 3.71ct lab-grown round diamond

This 3.71ct lab-grown round sits in the three to five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG639459451 or 639459451. Listed at 2 retailers as of October 30, 2026, with prices from £988 to £1,307, a £319 spread on the same certified stone. The Diamond Guys lists it at £1,307. 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
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG639459451
Dimensions10.08 × 10.04 × 6.04 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
10.08 mm10.04 mm3.71 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG639459451
Side View
Table 59.0%Crown 34.2°Girdle: MediumPavilion 40.8°Culet: NoneDepth 60.0%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Oct 30
Current: £2,075 GBP|Low: £200 GBP|High: £3,776 GBP|Avg: £1,006 GBP|-30.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
The Diamond Guys
August 3, 2026
Retailer 4£544 GBP
Retailer 8£602 GBP
Retailer 10£660 GBP
Retailer 12£672 GBP
Retailer 9£778 GBP
Retailer 6£778 GBP
Retailer 5£828 GBP
Retailer 7£988 GBP
Retailer 2£1,284 GBP
The Diamond Guys£1,307 GBP
Retailer 3£1,716 GBP
Retailer 1£2,075 GBP
Retailer 11£2,075 GBP

62 data points across 13 retailers

2 retailers£988 GBP to £1,307 GBP

B+
Cheapest Retailer
-
£988 GBP
CA$1,838 CAD
Most Expensive
B
The Diamond Guys
1954434369 · Oct 30
£1,307 GBP
$1,751 USD
View
1 more retailer has this diamond
Prices start from £988 GBPSave up to £319 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.

B+
3.71ct Round
£988 GBP