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Marquise|Lab Grown|IGI

1.57ct F SI1 Marquise Lab Grown Diamond

EX • F/SI1 • IGI LG786667721

Certificate IGI LG786667721

Diamond specifications and retailer prices

From $653 USD
As of November 5, 2026
Save $597 USD (48%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $1,250 USD at Brilliant Earth · As of November 6, 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 LG786667721 or 786667721. Listed at 2 retailers as of November 5, 2026, with prices from $653 to $1,250, a $597 spread on the same certified stone. Brilliant Earth lists it at $1,250. 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
OriginLab Grown
Grading LabIGI
CertificateIGI LG786667721
Dimensions12.10 × 5.97 × 3.84 mm
L/W Ratio2.03
Top View
12.10 mm5.97 mm1.57 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG786667721
Side View
Table 57.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 64.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $1,250 USD|Low: $653 USD|High: $1,250 USD|Avg: $852 USD
Brilliant Earth
Retailer 2
April 14, 2026
Retailer 2$653 USD
Brilliant Earth$1,250 USD

2 data points across 2 retailers

2 retailers$653 USD to $1,250 USD

B+
Cheapest Retailer
-
$653 USD
Most Expensive
B
Brilliant Earth
18325443A · Nov 6
$1,250 USD
View
1 more retailer has this diamond
Prices start from $653 USDSave up to $597 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.

B+
1.57ct Marquise
$653 USD