CaratHunter
Plans
Round|Lab Grown|IGI

3.71ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG631454051

Shape and cutting style on the report: Round brilliant

Certificate IGI LG631454051

Diamond specifications and retailer prices

From £971 GBP
CA$1,807 CAD
As of October 30, 2026
Save £313 GBP (24%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £1,284 GBP at The Diamond Guys · As of November 1, 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 LG631454051 or 631454051. Listed at 2 retailers as of October 30, 2026, with prices from £971 to £1,284, a £313 spread on the same certified stone. The Diamond Guys lists it at £1,284. 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 angle34.1°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG631454051
Dimensions9.99 × 9.91 × 6.11 mm
L/W Ratio1.01
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
9.99 mm9.91 mm3.71 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG631454051
Side View
Table 56.0%Crown 34.1°Girdle: MediumPavilion 40.8°Culet: NoneDepth 61.4%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £316 GBP|Low: £222 GBP|High: £3,776 GBP|Avg: £1,136 GBP|+42.4%
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
September 25, 2026
Retailer 1£316 GBP
Retailer 10£355 GBP
Retailer 7£531 GBP
Retailer 5£577 GBP
Retailer 6£593 GBP
Retailer 11£810 GBP
Retailer 9£897 GBP
Retailer 2£971 GBP
Retailer 8£1,032 GBP
The Diamond Guys£1,284 GBP
Retailer 12£1,640 GBP
Retailer 4£2,008 GBP
Retailer 3£3,776 GBP

4 data points across 13 retailers

2 retailers£971 GBP to £1,284 GBP

B+
Cheapest Retailer
-
£971 GBP
CA$1,807 CAD
Most Expensive
B
The Diamond Guys
1954434367 · Nov 1
£1,284 GBP
$1,721 USD
View
1 more retailer has this diamond
Prices start from £971 GBPSave up to £313 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
£971 GBP