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Round|Lab Grown|IGI

4.00ct E SI1 Round Lab Grown Diamond

EX • E/SI1 • IGI LG847640280

Shape and cutting style on the report: Round brilliant

Certificate IGI LG847640280

Diamond specifications and retailer prices

From £663 GBP
€846 EUR
As of October 29, 2026
Save £955 GBP (59%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £1,694 GBP at Rare Carat · As of October 21, 2026
View at Rare Carat

About this 4ct lab-grown round diamond

This 4ct 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 LG847640280 or 847640280. Listed at 4 retailers as of October 29, 2026, with a 144% 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

4.00
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.3°
Pavilion angle40.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG847640280
Dimensions10.44 × 10.35 × 6.06 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.44 mm10.35 mm4.00 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG847640280
Side View
Table 61.0%Crown 32.3°Girdle: MED-STKPavilion 40.4°Culet: NoneDepth 58.3%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 29
Current: £1,694 GBP|Low: £661 GBP|High: £1,694 GBP|Avg: £1,213 GBP
Rare Carat
Retailer 2
Retailer 3
Retailer 4
October 29, 2026
Retailer 2£663 GBP
Retailer 4£743 GBP
Retailer 3£1,618 GBP
Rare Carat£1,694 GBP

4 data points across 4 retailers

4 retailers£663 GBP to £1,618 GBP

A
Cheapest Retailer
-
£663 GBP
€846 EUR
A
Retailer 2
-
£743 GBP
$996 USD
View
B
Retailer 3
-
£1,618 GBP
View
Most Expensive
Rare Carat
LGRD40-176344 · Oct 21
£1,694 GBP
$2,270 USD
View
Price last confirmed 10 days ago
3 more retailers have this diamond
Prices start from £663 GBPSave up to £955 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
4.00ct Round
£663 GBP