CaratHunter
Plans
Round|Lab Grown|IGI

3.71ct F SI1 Round Lab Grown Diamond

EX • F/SI1 • IGI LG628436131

Shape and cutting style on the report: Round brilliant

Certificate IGI LG628436131

Diamond specifications and retailer prices

From £310 GBP
$416 USD
As of October 26, 2026
Save £2,443 GBP (89%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £4,463 GBP at Jared · As of October 28, 2026
View at Jared

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 LG628436131 or 628436131. Listed at 12 retailers as of October 26, 2026, with a 787% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.7°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG628436131
Dimensions9.93 × 9.97 × 5.99 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Top View
9.93 mm9.97 mm3.71 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG628436131
Side View
Table 58.0%Crown 32.7°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 60.2%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 26
Current: £1,570 GBP|Low: £254 GBP|High: £2,821 GBP|Avg: £1,121 GBP|-1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
October 29, 2026
Retailer 14£310 GBP
Retailer 8£348 GBP
Retailer 2£356 GBP
Retailer 9£592 GBP
Retailer 7£608 GBP
Retailer 12£608 GBP
Retailer 5£729 GBP
Retailer 6£784 GBP
Retailer 4£816 GBP
Retailer 10£1,080 GBP
Retailer 11£1,367 GBP
Retailer 1£1,570 GBP
Retailer 3£2,620 GBP
Retailer 13£2,754 GBP

33 data points across 14 retailers

12 retailers£310 GBP to £2,754 GBP

A
Cheapest Retailer
-
£310 GBP
$416 USD
A
Retailer 2
-
£348 GBP
$466 USD
View
A
Retailer 3
-
£356 GBP
$477 USD
View
Final sale: no returns
Retailer 4
-
£592 GBP
View
Price last confirmed 8 days ago
B+
Retailer 5
-
£608 GBP
$815 USD
View
A
Retailer 6
-
£608 GBP
$815 USD
View
B+
Retailer 7
-
£1,080 GBP
$1,447 USD
View
B+
Retailer 8
-
£1,367 GBP
$1,831 USD
View
B
Retailer 9
-
£1,570 GBP
View
B
Retailer 10
-
£2,620 GBP
$3,510 USD
View
B
Retailer 11
-
£2,754 GBP
$3,690 USD
View
Most Expensive
Jared
150918726 · Oct 28
£4,463 GBP
$5,980 USD
View
Price under review
11 more retailers have this diamond
Prices start from £310 GBPSave up to £2,443 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
£310 GBP