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Marquise|Lab Grown|IGI

1.57ct F SI1 Marquise Lab Grown Diamond

EX • F/SI1 • IGI LG840612730

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG840612730

Diamond specifications and retailer prices

From £170 GBP
$228 USD
As of November 1, 2026
Save £739 GBP (81%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £909 GBP at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 1.57ct lab-grown marquise diamond

This 1.57ct lab-grown marquise sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG840612730 or 840612730. Listed at 3 retailers as of November 1, 2026, with prices from £170 to £909, a £739 spread on the same certified stone. Brilliant Earth lists it at £909. 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
F
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840612730
Dimensions11.74 × 6.21 × 3.79 mm
L/W Ratio1.89
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.74 mm6.21 mm1.57 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840612730
Side View
Table 62.0%Crown 34.3°Girdle: MED-STKPavilion 40.3°Culet: NoneDepth 61.0%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: £909 GBP|Low: £170 GBP|High: £1,297 GBP|Avg: £652 GBP|-29.9%
Brilliant Earth
Retailer 2
Retailer 3
November 2, 2026
Retailer 3£170 GBP
Retailer 2£355 GBP
Brilliant Earth£909 GBP

29 data points across 3 retailers

3 retailers£170 GBP to £909 GBP

A
Cheapest Retailer
-
£170 GBP
$228 USD
Final sale: no returns
A
Retailer 2
-
£355 GBP
View
Most Expensive
B
Brilliant Earth
21613865A · Nov 2
£909 GBP
$1,220 USD
View
2 more retailers have this diamond
Prices start from £170 GBPSave up to £739 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 Marquise
£170 GBP