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Round|Lab Grown|IGI

3.57ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG678501209

Shape and cutting style on the report: Round brilliant

Certificate IGI LG678501209

Diamond specifications and retailer prices

From £643 GBP
€821 EUR
As of October 29, 2026
Save £1,872 GBP (74%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £2,515 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 3.57ct lab-grown round diamond

This 3.57ct 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 LG678501209 or 678501209. Listed at 15 retailers as of October 29, 2026, with prices from £643 to £2,515, a £1,872 spread on the same certified stone. Brilliant Earth lists it at £2,515. 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

3.57
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG678501209
Dimensions9.79 × 9.77 × 6.06 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
HEARTS & ARROWS This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.79 mm9.77 mm3.57 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG678501209
Side View
Table 58.0%Crown 35.1°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.0%

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: £2,515 GBP|Low: £399 GBP|High: £2,761 GBP|Avg: £1,032 GBP|-8.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 30, 2026
Retailer 4£399 GBP
Retailer 3£539 GBP
Retailer 5£643 GBP
Retailer 9£657 GBP
Retailer 12£726 GBP
Retailer 10£751 GBP
Retailer 2£776 GBP
Retailer 11£859 GBP
Retailer 6£1,207 GBP
Retailer 8£1,433 GBP
Retailer 7£1,962 GBP
Brilliant Earth£2,515 GBP

37 data points across 12 retailers

15 retailers£643 GBP to £2,515 GBP

Retailer 1
-
£321 GBP
$430 USD
Price last confirmed 37 days ago
Retailer 2
-
£360 GBP
$482 USD
View
Price last confirmed 37 days ago
Retailer 3
-
£393 GBP
$527 USD
View
Price last confirmed 33 days ago
Retailer 4
-
£539 GBP
View
Price last confirmed 22 days ago
A
Retailer 5
-
£643 GBP
€821 EUR
View
B+
Retailer 6
-
£657 GBP
$880 USD
View
B+
Retailer 7
-
£726 GBP
$973 USD
View
A
Retailer 8
-
£751 GBP
$1,006 USD
View
B+
Retailer 9
-
£776 GBP
View
B+
Retailer 10
-
£859 GBP
$1,151 USD
View
B
Retailer 11
-
£1,207 GBP
$1,617 USD
View
Retailer 12
-
£1,281 GBP
$1,716 USD
View
Price last confirmed 33 days ago
B
Retailer 13
-
£1,433 GBP
$1,920 USD
View
B
Retailer 14
-
£1,962 GBP
View
Most Expensive
B
Brilliant Earth
12973906A · Oct 29
£2,515 GBP
$3,370 USD
View
14 more retailers have this diamond
Prices start from £643 GBPSave up to £1,872 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
3.57ct Round
£643 GBP