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Round|Lab Grown|IGI

3.50ct E SI1 Round Lab Grown Diamond

EX • E/SI1 • IGI LG655421972

Shape and cutting style on the report: Round brilliant

Certificate IGI LG655421972

Diamond specifications and retailer prices

From £280 GBP
$373 USD
As of October 29, 2026
Save £1,154 GBP (80%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £1,434 GBP at Rare Carat · As of October 28, 2026
View at Rare Carat

About this 3.5ct lab-grown round diamond

This 3.5ct 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 LG655421972 or 655421972. Listed at 13 retailers as of October 28, 2026, with prices from £280 to £1,434, a £1,154 spread on the same certified stone. Rare Carat lists it at £1,434. 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

3.50
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.7°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG655421972
Dimensions9.83 × 9.80 × 5.88 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
9.83 mm9.80 mm3.50 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG655421972
Side View
Table 61.0%Crown 33.7°Girdle: MediumPavilion 40.8°Culet: NoneDepth 60.0%

Caratlytics Score

How it works →
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: £1,434 GBP|Low: £280 GBP|High: £3,601 GBP|Avg: £1,052 GBP|-27.5%
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
October 30, 2026
Retailer 9£280 GBP
Retailer 5£325 GBP
Retailer 4£348 GBP
Retailer 13£384 GBP
Retailer 10£458 GBP
Retailer 2£466 GBP
Retailer 15£555 GBP
Retailer 11£555 GBP
Retailer 12£597 GBP
Retailer 8£626 GBP
Retailer 14£803 GBP
Retailer 3£1,117 GBP
Rare Carat£1,434 GBP
Retailer 7£2,621 GBP
Retailer 6£3,601 GBP

4 data points across 15 retailers

13 retailers£280 GBP to £1,434 GBP

A
Cheapest Retailer
-
£280 GBP
$373 USD
A
Retailer 2
-
£325 GBP
$433 USD
View
A
Retailer 3
-
£348 GBP
$463 USD
View
A
Retailer 4
-
£384 GBP
HK$4,000 HKD
View
A
Retailer 5
-
£458 GBP
$610 USD
View
A
Retailer 6
-
£466 GBP
View
B+
Retailer 7
-
£555 GBP
$739 USD
View
A
Retailer 8
-
£555 GBP
€704 EUR
View
A
Retailer 9
-
£597 GBP
$795 USD
View
A
Retailer 10
-
£626 GBP
View
B+
Retailer 11
-
£803 GBP
$1,069 USD
View
B+
Retailer 12
-
£1,117 GBP
$1,488 USD
View
Most Expensive
B
Rare Carat
KI9724219KF655 · Oct 28
£1,434 GBP
$1,910 USD
View
12 more retailers have this diamond
Prices start from £280 GBPSave up to £1,154 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
3.50ct Round
£280 GBP