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Round|Lab Grown|IGI

1.56ct J SI1 Round Lab Grown Diamond

ID • J/SI1 • IGI LG494173834

Shape and cutting style on the report: Round brilliant

Certificate IGI LG494173834

Diamond specifications and retailer prices

From £642 GBP
$860 USD
As of October 31, 2026
Save £2,714 GBP (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £3,355 GBP at MOH London · As of November 1, 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG494173834 or 494173834. Listed at 11 retailers as of October 31, 2026, with prices from £642 to £3,355, a £2,714 spread on the same certified stone. MOH London lists it at £3,355. 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
J
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.9°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG494173834
Dimensions7.62 × 7.57 × 4.46 mm
L/W Ratio1.01
Girdle conditionFaceted
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
7.62 mm7.57 mm1.56 ctJ / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG494173834
Side View
Table 59.0%Crown 32.9°Girdle: MediumPavilion 40.3°Culet: NoneDepth 58.7%

Caratlytics Score

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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: £3,355 GBP|Low: £642 GBP|High: £3,396 GBP|Avg: £1,519 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 1, 2026
Retailer 2£642 GBP
Retailer 3£900 GBP
Retailer 6£1,008 GBP
Retailer 4£1,044 GBP
Retailer 7£1,172 GBP
Retailer 9£1,478 GBP
Retailer 5£1,656 GBP
Retailer 8£2,001 GBP
MOH London£3,355 GBP

14 data points across 9 retailers

11 retailers£642 GBP to £3,355 GBP

A
Cheapest Retailer
-
£642 GBP
$860 USD
A
Retailer 2
-
£900 GBP
$1,206 USD
View
B+
Retailer 3
-
£980 GBP
$1,313 USD
View
B+
Retailer 4
-
£1,008 GBP
$1,351 USD
View
Final sale: no returns
Retailer 5
-
£1,044 GBP
$1,399 USD
View
Price last confirmed 20 days ago
B+
Retailer 6
-
£1,044 GBP
$1,399 USD
View
B+
Retailer 7
-
£1,172 GBP
$1,570 USD
View
B
Retailer 8
-
£1,656 GBP
$2,219 USD
View
B
Retailer 9
-
£1,958 GBP
$2,623 USD
View
B
Retailer 10
-
£2,001 GBP
$2,681 USD
View
Most Expensive
B
MOH London
LG494173834 · Nov 1
£3,355 GBP
View
10 more retailers have this diamond
Prices start from £642 GBPSave up to £2,714 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
£642 GBP