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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 $228 USD
As of November 1, 2026
Save $992 USD (81%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $1,220 USD 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 $228 to $1,220, a $992 spread on the same certified stone. Brilliant Earth lists it at $1,220. 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
Color
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: $1,220 USD|Low: $228 USD|High: $1,740 USD|Avg: $875 USD|-29.9%
Brilliant Earth
Retailer 2
Retailer 3
November 2, 2026
Retailer 3$228 USD
Retailer 2$477 USD
Brilliant Earth$1,220 USD

29 data points across 3 retailers

3 retailers$228 USD to $1,220 USD

A
Cheapest Retailer
-
$228 USD
Final sale: no returns
A
Retailer 2
-
$477 USD
£375 GBP
View
Most Expensive
B
Brilliant Earth
21613865A · Nov 2
$1,220 USD
View
2 more retailers have this diamond
Prices start from $228 USDSave up to $992 USD

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
$228 USD