CaratHunter
Plans
Marquise|Lab Grown|IGI

0.51ct D SI1 Marquise Lab Grown Diamond

EX • D/SI1 • IGI LG817665899

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG817665899

Diamond specifications and retailer prices

From €141 EUR
$158 USD
As of November 1, 2026
Save €628 EUR (82%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: €769 EUR at MOH London · As of October 29, 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG817665899 or 817665899. Listed at 8 retailers as of October 29, 2026, with prices from €141 to €769, a €628 spread on the same certified stone. MOH London lists it at €769. 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
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle37.5°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG817665899
Dimensions8.18 × 4.05 × 2.65 mm
L/W Ratio2.02
Girdle conditionFaceted
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
8.18 mm4.05 mm0.51 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG817665899
Side View
Table 63.0%Crown 37.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 65.4%

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 1
Current: €769 EUR|Low: €111 EUR|High: €774 EUR|Avg: €294 EUR|+0.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 5€111 EUR
Retailer 8€141 EUR
Retailer 6€165 EUR
Retailer 3€193 EUR
Retailer 2€197 EUR
Retailer 4€251 EUR
Retailer 7€339 EUR
MOH London€769 EUR

44 data points across 8 retailers

8 retailers€141 EUR to €769 EUR

Retailer 1
-
€111 EUR
$124 USD
Price last confirmed 8 days ago
A
Retailer 2
-
€141 EUR
$158 USD
View
A
Retailer 3
-
€165 EUR
$185 USD
View
A
Retailer 4
-
€193 EUR
View
B+
Retailer 5
-
€197 EUR
£174 GBP
View
B+
Retailer 6
-
€251 EUR
£222 GBP
View
B
Retailer 7
-
€339 EUR
$380 USD
View
Most Expensive
B
MOH London
LG817665899 · Oct 29
€769 EUR
£679 GBP
View
7 more retailers have this diamond
Prices start from €141 EURSave up to €628 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.

A
0.51ct Marquise
€141 EUR