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Round|Lab Grown|IGI

1.56ct G SI2 Round Lab Grown Diamond

ID • G/SI2 • IGI LG389999546

Shape and cutting style on the report: Round brilliant

Certificate IGI LG389999546

Diamond specifications and retailer prices

From £300 GBP
$402 USD
As of October 30, 2026
Save £602 GBP (67%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £902 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 1.56ct lab-grown round diamond

This 1.56ct lab-grown round sits in the one-and-a-half to two carat band, graded G colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG389999546 or 389999546. Listed at 6 retailers as of October 29, 2026, with prices from £300 to £902, a £602 spread on the same certified stone. MOH London lists it at £902. 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
G
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.9°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG389999546
Dimensions7.47 × 7.40 × 4.56 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory grown diamond was created by chemical vapor deposition process (CVD) and is type IIa
Top View
7.47 mm7.40 mm1.56 ctG / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG389999546
Side View
Table 59.0%Crown 34.9°Girdle: MediumPavilion 40.9°Culet: NoneDepth 61.2%

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: Oct 30
Current: £902 GBP|Low: £300 GBP|High: £909 GBP|Avg: £460 GBP|-0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 30, 2026
Retailer 6£300 GBP
Retailer 4£346 GBP
Retailer 3£422 GBP
Retailer 2£424 GBP
Retailer 5£450 GBP
MOH London£902 GBP

38 data points across 6 retailers

6 retailers£300 GBP to £902 GBP

A
Cheapest Retailer
-
£300 GBP
$402 USD
B+
Retailer 2
-
£346 GBP
$464 USD
View
B+
Retailer 3
-
£422 GBP
$565 USD
View
B+
Retailer 4
-
£424 GBP
View
B+
Retailer 5
-
£450 GBP
$603 USD
View
Most Expensive
B
MOH London
LG389999546 · Oct 29
£902 GBP
View
5 more retailers have this diamond
Prices start from £300 GBPSave up to £602 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 Round
£300 GBP