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Marquise|Lab Grown|IGI

1.00ct H SI1 Marquise Lab Grown Diamond

ID • H/SI1 • IGI LG514268659

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG514268659

Diamond specifications and retailer prices

From £426 GBP
$571 USD
As of November 2, 2026
Save £1,879 GBP (82%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,304 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 1ct lab-grown marquise diamond

This 1ct lab-grown marquise sits in the classic one-carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG514268659 or 514268659. Listed at 11 retailers as of October 29, 2026, with prices from £426 to £2,304, a £1,879 spread on the same certified stone. MOH London lists it at £2,304. 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

1.00
Carat
H
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle35°
OriginLab Grown
Grading LabIGI
CertificateIGI LG514268659
Dimensions10.20 × 5.31 × 3.02 mm
L/W Ratio1.92
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
10.20 mm5.31 mm1.00 ctH / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG514268659
Side View
Table 53.5%Crown 35°Girdle: THN-STKPavilion 35°Culet: NoneDepth 56.9%

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: £2,304 GBP|Low: £409 GBP|High: £2,320 GBP|Avg: £943 GBP|-0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 5£426 GBP
Retailer 2£432 GBP
Retailer 8£477 GBP
Retailer 6£528 GBP
Retailer 3£626 GBP
Retailer 7£813 GBP
Retailer 9£840 GBP
Retailer 4£1,310 GBP
Retailer 10£1,415 GBP
MOH London£2,304 GBP

19 data points across 10 retailers

11 retailers£426 GBP to £2,304 GBP

A
Cheapest Retailer
-
£426 GBP
$571 USD
A
Retailer 2
-
£432 GBP
$580 USD
View
A
Retailer 3
-
£477 GBP
$640 USD
View
Final sale: no returns
A
Retailer 4
-
£477 GBP
$640 USD
View
Retailer 5
-
£528 GBP
$709 USD
View
Price last confirmed 17 days ago
A
Retailer 6
-
£528 GBP
$709 USD
View
B+
Retailer 7
-
£626 GBP
$840 USD
View
B+
Retailer 8
-
£813 GBP
$1,091 USD
View
B
Retailer 9
-
£1,310 GBP
$1,758 USD
View
B
Retailer 10
-
£1,389 GBP
$1,864 USD
View
Most Expensive
B
MOH London
LG514268659 · Oct 29
£2,304 GBP
View
10 more retailers have this diamond
Prices start from £426 GBPSave up to £1,879 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
1.00ct Marquise
£426 GBP