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1.51ct H SI1 Round Lab Grown Diamond

EX • H/SI1 • IGI LG851661425

Shape and cutting style on the report: Round brilliant

Certificate IGI LG851661425

Diamond specifications and retailer prices

From £290 GBP
$388 USD
As of November 1, 2026
Save £472 GBP (62%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £762 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 1.51ct lab-grown round diamond

This 1.51ct lab-grown round sits in the one-and-a-half to two carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG851661425 or 851661425. Listed at 4 retailers as of November 1, 2026, with prices from £290 to £762, a £472 spread on the same certified stone. MOH London lists it at £762. 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.1°
Pavilion angle41.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG851661425
Dimensions7.39 × 7.44 × 4.53 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.39 mm7.44 mm1.51 ctH / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG851661425
Side View
Table 59.0%Crown 33.1°Girdle: MED-STKPavilion 41.5°Culet: NoneDepth 61.1%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: £762 GBP|Low: £290 GBP|High: £767 GBP|Avg: £494 GBP|-0.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
November 1, 2026
Retailer 3£290 GBP
Retailer 2£413 GBP
Retailer 4£413 GBP
MOH London£762 GBP

3 data points across 4 retailers

4 retailers£290 GBP to £762 GBP

B+
Cheapest Retailer
-
£290 GBP
$388 USD
A
Retailer 2
-
£413 GBP
$553 USD
View
A
Retailer 3
-
£413 GBP
$554 USD
View
Most Expensive
B+
MOH London
LG851661425 · Nov 1
£762 GBP
View
3 more retailers have this diamond
Prices start from £290 GBPSave up to £472 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
1.51ct Round
£290 GBP