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Marquise|Lab Grown|IGI

0.51ct I SI1 Marquise Lab Grown Diamond

VG • I/SI1 • IGI LG414082005

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG414082005

Diamond specifications and retailer prices

From £204 GBP
$274 USD
As of November 2, 2026
Save £818 GBP (80%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £1,023 GBP 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG414082005 or 414082005. Listed at 11 retailers as of October 29, 2026, with prices from £204 to £1,023, a £818 spread on the same certified stone. MOH London lists it at £1,023. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
I
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryGood
FluorescenceNone
Crown angle33.1°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG414082005
Dimensions8.50 × 4.28 × 2.54 mm
L/W Ratio1.99
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory grown diamond was created by chemical vapor deposition process (CVD) Type IIa
Top View
8.50 mm4.28 mm0.51 ctI / SI1
OriginLab Grown
CutVery Good
PolishVery Good
SymmetryGood
FluorescenceNone
CertificateIGI LG414082005
Side View
Table 57.5%Crown 33.1°Girdle: THN-MEDPavilion 40.2°Culet: NoneDepth 59.3%

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: £1,023 GBP|Low: £196 GBP|High: £1,030 GBP|Avg: £495 GBP|+0.5%
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
October 30, 2026
Retailer 9£204 GBP
Retailer 3£229 GBP
Retailer 13£237 GBP
Retailer 2£239 GBP
Retailer 10£254 GBP
Retailer 14£254 GBP
Retailer 4£373 GBP
Retailer 12£421 GBP
Retailer 7£472 GBP
Retailer 5£517 GBP
Retailer 8£780 GBP
Retailer 11£816 GBP
Retailer 6£1,021 GBP
MOH London£1,023 GBP

22 data points across 14 retailers

11 retailers£204 GBP to £1,023 GBP

A
Cheapest Retailer
-
£204 GBP
$274 USD
B+
Retailer 2
-
£229 GBP
$307 USD
View
Final sale: no returns
B+
Retailer 3
-
£237 GBP
$318 USD
View
B+
Retailer 4
-
£239 GBP
$320 USD
View
Retailer 5
-
£254 GBP
$340 USD
View
Price last confirmed 7 days ago
B+
Retailer 6
-
£254 GBP
$340 USD
View
B
Retailer 7
-
£421 GBP
$564 USD
View
Retailer 8
-
£472 GBP
€602 EUR
View
Price last confirmed 7 days ago
B
Retailer 9
-
£780 GBP
$1,045 USD
View
C
Retailer 10
-
£816 GBP
$1,094 USD
View
Most Expensive
B
MOH London
LG414082005 · Oct 29
£1,023 GBP
View
10 more retailers have this diamond
Prices start from £204 GBPSave up to £818 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
£204 GBP