CaratHunter
Plans
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 £228 GBP
$305 USD
As of November 2, 2026
Save £904 GBP (80%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £1,132 GBP 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 £228 to £1,132, a £904 spread on the same certified stone. MOH London lists it at £1,132. 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
Colour
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
undefined
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: £1,132 GBP|Low: £219 GBP|High: £1,145 GBP|Avg: £560 GBP
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£228 GBP
Retailer 9£239 GBP
Retailer 3£255 GBP
Retailer 8£257 GBP
Retailer 15£264 GBP
Retailer 12£282 GBP
Retailer 16£282 GBP
Retailer 5£399 GBP
Retailer 14£460 GBP
Retailer 2£516 GBP
Retailer 6£555 GBP
Retailer 10£868 GBP
Retailer 13£908 GBP
Retailer 4£1,071 GBP
MOH London£1,132 GBP
Retailer 7£1,135 GBP

23 data points across 16 retailers

12 retailers£228 GBP to £1,132 GBP

A
Cheapest Retailer
-
£228 GBP
$305 USD
A
Retailer 2
-
£239 GBP
$320 USD
View
B+
Retailer 3
-
£255 GBP
$342 USD
View
Final sale: no returns
B+
Retailer 4
-
£264 GBP
$354 USD
View
Retailer 5
-
£282 GBP
$378 USD
View
Price last confirmed 8 days ago
B+
Retailer 6
-
£282 GBP
$378 USD
View
B
Retailer 7
-
£460 GBP
$617 USD
View
B
Retailer 8
-
£516 GBP
€659 EUR
View
B
Retailer 9
-
£868 GBP
$1,163 USD
View
B
Retailer 10
-
£908 GBP
$1,216 USD
View
B
Retailer 11
-
£1,071 GBP
$1,434 USD
View
Most Expensive
B
MOH London
LG440011400 · Nov 1
£1,132 GBP
View
11 more retailers have this diamond
Prices start from £228 GBPSave up to £904 GBP

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
£228 GBP