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Marquise|Lab Grown|IGI

0.51ct H SI1 Marquise Lab Grown Diamond

ID • H/SI1 • IGI LG440011400

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG440011400

Diamond specifications and retailer prices

From $305 USD
As of November 2, 2026
Save $1,211 USD (80%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,516 USD at MOH London · As of November 1, 2026
View at MOH London

About this 0.51ct lab-grown marquise diamond

This 0.51ct lab-grown marquise sits in the half to three-quarter carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG440011400 or 440011400. Listed at 12 retailers as of November 1, 2026, with prices from $305 to $1,516, a $1,211 spread on the same certified stone. MOH London lists it at $1,516. 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

0.51
Carat
H
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle35.3°
Pavilion angle39.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG440011400
Dimensions7.93 × 4.24 × 2.60 mm
L/W Ratio1.87
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.93 mm4.24 mm0.51 ctH / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG440011400
Side View
Table 55.5%Crown 35.3°Girdle: MED-STKPavilion 39.6°Culet: NoneDepth 61.3%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: $1,516 USD|Low: $293 USD|High: $1,534 USD|Avg: $750 USD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
November 1, 2026
Retailer 11$305 USD
Retailer 9$320 USD
Retailer 3$342 USD
Retailer 8$344 USD
Retailer 15$354 USD
Retailer 12$378 USD
Retailer 16$378 USD
Retailer 5$535 USD
Retailer 14$617 USD
Retailer 2$692 USD
Retailer 6$744 USD
Retailer 10$1,163 USD
Retailer 13$1,216 USD
Retailer 4$1,434 USD
MOH London$1,516 USD
Retailer 7$1,520 USD

23 data points across 16 retailers

12 retailers$305 USD to $1,516 USD

A
Cheapest Retailer
-
$305 USD
A
Retailer 2
-
$320 USD
View
B+
Retailer 3
-
$342 USD
View
Final sale: no returns
B+
Retailer 4
-
$354 USD
View
Retailer 5
-
$378 USD
View
Price last confirmed 7 days ago
B+
Retailer 6
-
$378 USD
View
B
Retailer 7
-
$617 USD
View
B
Retailer 8
-
$692 USD
€659 EUR
View
B
Retailer 9
-
$1,163 USD
View
B
Retailer 10
-
$1,216 USD
View
B
Retailer 11
-
$1,434 USD
View
Most Expensive
B
MOH London
LG440011400 · Nov 1
$1,516 USD
£1,194 GBP
View
11 more retailers have this diamond
Prices start from $305 USDSave up to $1,211 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
0.51ct Marquise
$305 USD