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Marquise|Lab Grown|IGI

1.51ct F SI1 Marquise Lab Grown Diamond

ID • F/SI1 • IGI LG840627168

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG840627168

Diamond specifications and retailer prices

From £864 GBP
$1,160 USD
As of October 31, 2026
Save £1 GBP (0%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £865 GBP at MOH London · As of October 26, 2026
View at MOH London

About this 1.51ct lab-grown marquise diamond

This 1.51ct lab-grown marquise sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG840627168 or 840627168. Listed at 4 retailers as of October 26, 2026, with a relatively tight 0% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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

1.51
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle39.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840627168
Dimensions12.15 × 6.01 × 3.63 mm
L/W Ratio2.02
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
12.15 mm6.01 mm1.51 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840627168
Side View
Table 62.0%Crown 35.4°Girdle: MED-STKPavilion 39.1°Culet: NoneDepth 60.4%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 31
Current: £865 GBP|Low: £262 GBP|High: £865 GBP|Avg: £580 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
October 30, 2026
Retailer 4£262 GBP
Retailer 3£630 GBP
Retailer 2£864 GBP
MOH London£865 GBP

3 data points across 4 retailers

4 retailers£864 GBP to £865 GBP

Retailer 1
-
£262 GBP
$352 USD
Price last confirmed 8 days ago
Retailer 2
-
£630 GBP
$845 USD
View
Price last confirmed 7 days ago
B
Retailer 3
-
£864 GBP
$1,160 USD
View
Most Expensive
B
MOH London
LG840627168 · Oct 26
£865 GBP
View
3 more retailers have this diamond
Prices start from £864 GBPSave up to £1 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.

B
1.51ct Marquise
£864 GBP