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Marquise|Lab Grown|IGI

1.28ct D SI1 Marquise Lab Grown Diamond

VG • D/SI1 • IGI LG843658870

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG843658870

Diamond specifications and retailer prices

From £184 GBP
As of November 4, 2026
Save £535 GBP (74%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £718 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.28ct lab-grown marquise diamond

This 1.28ct lab-grown marquise sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG843658870 or 843658870. Listed at 7 retailers as of November 4, 2026, with prices from £184 to £718, a £535 spread on the same certified stone. MOH London lists it at £718. 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

1.28
Carat
D
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.2°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG843658870
Dimensions11.23 × 5.69 × 3.53 mm
L/W Ratio1.97
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.23 mm5.69 mm1.28 ctD / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG843658870
Side View
Table 59.0%Crown 35.2°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.0%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £718 GBP|Low: £184 GBP|High: £951 GBP|Avg: £443 GBP|-0.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 5, 2026
Retailer 3£184 GBP
Retailer 2£270 GBP
Retailer 6£277 GBP
Retailer 7£357 GBP
Retailer 5£523 GBP
Retailer 4£669 GBP
MOH London£718 GBP

15 data points across 7 retailers

7 retailers£184 GBP to £718 GBP

A
Cheapest Retailer
-
£184 GBP
A
Retailer 2
-
£270 GBP
View
B+
Retailer 3
-
£277 GBP
View
B+
Retailer 4
-
£357 GBP
View
B
Retailer 5
-
£523 GBP
View
B
Retailer 6
-
£669 GBP
View
Most Expensive
B
MOH London
LG843658870 · Nov 5
£718 GBP
View
6 more retailers have this diamond
Prices start from £184 GBPSave up to £535 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
1.28ct Marquise
£184 GBP