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Radiant|Lab Grown|IGI

1.56ct H SI1 Radiant Lab Grown Diamond

ID • H/SI1 • IGI LG512224126

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG512224126

Diamond specifications and retailer prices

From £746 GBP
$1,000 USD
As of October 31, 2026
Save £2,932 GBP (80%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £3,679 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 1.56ct lab-grown radiant diamond

This 1.56ct lab-grown radiant 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 LG512224126 or 512224126. Listed at 10 retailers as of October 31, 2026, with prices from £746 to £3,679, a £2,932 spread on the same certified stone. MOH London lists it at £3,679. 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

1.56
Carat
H
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.1°
Pavilion angle35.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG512224126
Dimensions7.91 × 6.11 × 3.93 mm
L/W Ratio1.29
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
7.91 mm6.11 mm1.56 ctH / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG512224126
Side View
Table 66.5%Crown 38.1°Girdle: Slightly ThickPavilion 35.6°Culet: NoneDepth 64.3%

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: Oct 31
Current: £3,679 GBP|Low: £746 GBP|High: £3,728 GBP|Avg: £1,886 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 1, 2026
Retailer 2£746 GBP
Retailer 3£1,111 GBP
Retailer 4£1,288 GBP
Retailer 6£1,414 GBP
Retailer 8£1,746 GBP
Retailer 5£2,029 GBP
Retailer 7£2,338 GBP
MOH London£3,679 GBP

14 data points across 8 retailers

10 retailers£746 GBP to £3,679 GBP

A
Cheapest Retailer
-
£746 GBP
$1,000 USD
B+
Retailer 2
-
£1,111 GBP
$1,488 USD
View
B+
Retailer 3
-
£1,208 GBP
$1,619 USD
View
Retailer 4
-
£1,288 GBP
$1,726 USD
View
Price last confirmed 20 days ago
B+
Retailer 5
-
£1,288 GBP
$1,726 USD
View
B+
Retailer 6
-
£1,414 GBP
$1,895 USD
View
B
Retailer 7
-
£2,029 GBP
$2,719 USD
View
B
Retailer 8
-
£2,338 GBP
$3,132 USD
View
B
Retailer 9
-
£2,414 GBP
$3,235 USD
View
Most Expensive
B
MOH London
LG512224126 · Nov 1
£3,679 GBP
View
9 more retailers have this diamond
Prices start from £746 GBPSave up to £2,932 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
1.56ct Radiant
£746 GBP