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Heart|Lab Grown|IGI

1.57ct E SI1 Heart Lab Grown Diamond

EX • E/SI1 • IGI LG656489091

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG656489091

Diamond specifications and retailer prices

From £166 GBP
$221 USD
As of October 30, 2026
Save £675 GBP (80%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £841 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.57ct lab-grown heart diamond

This 1.57ct lab-grown heart sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG656489091 or 656489091. Listed at 15 retailers as of October 29, 2026, with prices from £166 to £841, a £675 spread on the same certified stone. Brilliant Earth lists it at £841. 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

1.57
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.4°
Pavilion angle39.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG656489091
Dimensions7.30 × 8.05 × 4.56 mm
L/W Ratio1.10
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.30 mm8.05 mm1.57 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG656489091
Side View
Table 62.0%Crown 37.4°Girdle: MED-THKPavilion 39.2°Culet: NoneDepth 56.6%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 30
Current: £841 GBP|Low: £164 GBP|High: £861 GBP|Avg: £393 GBP
Brilliant Earth
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 4£166 GBP
Retailer 5£185 GBP
Retailer 15£192 GBP
Retailer 9£206 GBP
Retailer 7£213 GBP
Retailer 2£264 GBP
Retailer 14£276 GBP
Retailer 10£345 GBP
Retailer 3£369 GBP
Retailer 8£382 GBP
Retailer 12£398 GBP
Retailer 6£552 GBP
Retailer 13£661 GBP
Retailer 11£828 GBP
Brilliant Earth£841 GBP

39 data points across 15 retailers

15 retailers£166 GBP to £841 GBP

A
Cheapest Retailer
-
£166 GBP
$221 USD
A
Retailer 2
-
£185 GBP
$247 USD
View
Final sale: no returns
A
Retailer 3
-
£192 GBP
$256 USD
View
A
Retailer 4
-
£206 GBP
$274 USD
View
A
Retailer 5
-
£213 GBP
$283 USD
View
A
Retailer 6
-
£264 GBP
View
B+
Retailer 7
-
£276 GBP
$368 USD
View
A
Retailer 8
-
£345 GBP
€438 EUR
View
B+
Retailer 9
-
£369 GBP
$492 USD
View
B+
Retailer 10
-
£382 GBP
View
B+
Retailer 11
-
£398 GBP
$530 USD
View
B
Retailer 12
-
£552 GBP
$735 USD
View
B
Retailer 13
-
£661 GBP
$880 USD
View
B
Retailer 14
-
£828 GBP
View
Most Expensive
B
Brilliant Earth
13055813A · Oct 29
£841 GBP
$1,120 USD
View
14 more retailers have this diamond
Prices start from £166 GBPSave up to £675 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
1.57ct Heart
£166 GBP