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Round|Lab Grown|IGI

3.51ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG594321539

Shape and cutting style on the report: Round brilliant

Certificate IGI LG594321539

Diamond specifications and retailer prices

From £637 GBP
€808 EUR
As of October 29, 2026
Save £1,848 GBP (74%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £2,486 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 3.51ct lab-grown round diamond

This 3.51ct 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 LG594321539 or 594321539. Listed at 13 retailers as of October 29, 2026, with prices from £637 to £2,486, a £1,848 spread on the same certified stone. Brilliant Earth lists it at £2,486. 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

3.51
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.8°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG594321539
Dimensions9.82 × 9.90 × 5.97 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
9.82 mm9.90 mm3.51 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG594321539
Side View
Table 58.0%Crown 33.8°Girdle: MediumPavilion 41.2°Culet: NoneDepth 60.6%

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 29
Current: £2,486 GBP|Low: £255 GBP|High: £2,733 GBP|Avg: £979 GBP|-9.1%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 10£357 GBP
Retailer 4£637 GBP
Retailer 7£650 GBP
Retailer 8£720 GBP
Retailer 9£754 GBP
Retailer 2£768 GBP
Retailer 6£838 GBP
Retailer 5£1,244 GBP
Retailer 3£1,943 GBP
Brilliant Earth£2,486 GBP

37 data points across 10 retailers

13 retailers£637 GBP to £2,486 GBP

Retailer 1
-
£318 GBP
$424 USD
Price last confirmed 36 days ago
Retailer 2
-
£357 GBP
$475 USD
View
Price last confirmed 36 days ago
Retailer 3
-
£390 GBP
$519 USD
View
Price last confirmed 32 days ago
A
Retailer 4
-
£637 GBP
€808 EUR
View
A
Retailer 5
-
£650 GBP
$865 USD
View
B+
Retailer 6
-
£720 GBP
$959 USD
View
A
Retailer 7
-
£754 GBP
$1,004 USD
View
B+
Retailer 8
-
£768 GBP
View
B+
Retailer 9
-
£838 GBP
$1,116 USD
View
B+
Retailer 10
-
£1,244 GBP
$1,657 USD
View
Retailer 11
-
£1,268 GBP
$1,689 USD
View
Price last confirmed 33 days ago
B
Retailer 12
-
£1,943 GBP
View
Most Expensive
B
Brilliant Earth
7880315A · Oct 29
£2,486 GBP
$3,310 USD
View
12 more retailers have this diamond
Prices start from £637 GBPSave up to £1,848 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
3.51ct Round
£637 GBP