CaratHunter
Plans
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 €582 EUR
£514 GBP
As of November 2, 2026
Save €532 EUR (48%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: €1,114 EUR 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 LG786667721 or 786667721. Listed at 2 retailers as of November 2, 2026, with prices from €582 to €1,114, a €532 spread on the same certified stone. Brilliant Earth lists it at €1,114. 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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: €1,114 EUR|Low: €582 EUR|High: €1,114 EUR|Avg: €760 EUR
Brilliant Earth
Retailer 2
April 14, 2026
Retailer 2€582 EUR
Brilliant Earth€1,114 EUR

2 data points across 2 retailers

2 retailers€582 EUR to €1,114 EUR

B+
Cheapest Retailer
-
€582 EUR
£514 GBP
Most Expensive
B
Brilliant Earth
18325443A · Nov 2
€1,114 EUR
$1,250 USD
View
1 more retailer has this diamond
Prices start from €582 EURSave up to €532 EUR

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
€582 EUR