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Marquise|Lab Grown|IGI

1.00ct I SI1 Marquise Lab Grown Diamond

ID • I/SI1 • IGI LG436047370

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG436047370

Diamond specifications and retailer prices

From £446 GBP
As of November 4, 2026
Save £2,460 GBP (85%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,905 GBP at MOH London · As of November 3, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG436047370 or 436047370. Listed at 11 retailers as of November 3, 2026, with prices from £446 to £2,905, a £2,460 spread on the same certified stone. MOH London lists it at £2,905. 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
I
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle34.2°
Pavilion angle38.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG436047370
Dimensions9.63 × 5.35 × 3.21 mm
L/W Ratio1.80
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
9.63 mm5.35 mm1.00 ctI / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG436047370
Side View
Table 54.5%Crown 34.2°Girdle: STK-VTKPavilion 38.5°Culet: NoneDepth 60.0%

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 4
Current: £2,905 GBP|Low: £446 GBP|High: £2,944 GBP|Avg: £1,408 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 3, 2026
Retailer 2£446 GBP
Retailer 4£739 GBP
Retailer 7£827 GBP
Retailer 5£857 GBP
Retailer 8£988 GBP
Retailer 9£1,233 GBP
Retailer 6£1,369 GBP
Retailer 3£1,846 GBP
Retailer 10£2,453 GBP
MOH London£2,905 GBP

16 data points across 10 retailers

11 retailers£446 GBP to £2,905 GBP

A
Cheapest Retailer
-
£446 GBP
B+
Retailer 2
-
£739 GBP
View
B+
Retailer 3
-
£803 GBP
View
B
Retailer 4
-
£827 GBP
View
Final sale: no returns
Retailer 5
-
£857 GBP
View
Price last confirmed 25 days ago
B
Retailer 6
-
£857 GBP
View
B
Retailer 7
-
£988 GBP
View
B
Retailer 8
-
£1,369 GBP
View
B
Retailer 9
-
£1,606 GBP
View
B
Retailer 10
-
£1,846 GBP
View
Most Expensive
B
MOH London
LG436047370 · Nov 3
£2,905 GBP
View
10 more retailers have this diamond
Prices start from £446 GBPSave up to £2,460 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
£446 GBP