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Marquise|Lab Grown|IGI

4.51ct F SI1 Marquise Lab Grown Diamond

ID • F/SI1 • IGI LG628401655

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG628401655

Diamond specifications and retailer prices

From €1,494 EUR
A$2,578 AUD
As of November 2, 2026
Save €656 EUR (31%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: €3,207 EUR at Rare Carat · As of September 13, 2026
View at Rare Carat

About this 4.51ct lab-grown marquise diamond

This 4.51ct lab-grown marquise sits in the three to five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG628401655 or 628401655. Listed at 3 retailers as of November 2, 2026, with a 44% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

4.51
Carat
F
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.6°
Pavilion angle39.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG628401655
Dimensions16.98 × 8.63 × 5.30 mm
L/W Ratio1.97
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
16.98 mm8.63 mm4.51 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG628401655
Side View
Table 59.0%Crown 33.6°Girdle: MED-STKPavilion 39.5°Culet: NoneDepth 61.4%

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 2
Current: €3,207 EUR|Low: €673 EUR|High: €6,170 EUR|Avg: €1,882 EUR
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 29, 2026
Retailer 8€673 EUR
Retailer 11€860 EUR
Retailer 10€983 EUR
Retailer 9€999 EUR
Retailer 6€1,093 EUR
Retailer 12€1,100 EUR
Retailer 3€1,237 EUR
Retailer 2€1,494 EUR
Retailer 4€1,623 EUR
Retailer 5€2,302 EUR
Retailer 7€2,939 EUR
Rare Carat€3,207 EUR
Retailer 13€6,170 EUR

5 data points across 13 retailers

3 retailers€1,494 EUR to €2,150 EUR

B+
Cheapest Retailer
-
€1,494 EUR
A$2,578 AUD
B
Retailer 2
-
€2,150 EUR
£1,899 GBP
View
Most Expensive
Rare Carat
A145-6800 · Sep 13
€3,207 EUR
$3,597 USD
View
Price last confirmed 50 days ago
2 more retailers have this diamond
Prices start from €1,494 EURSave up to €656 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+
4.51ct Marquise
€1,494 EUR