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Round|Lab Grown|IGI

1.56ct I SI2 Round Lab Grown Diamond

ID • I/SI2 • IGI LG425065175

Shape and cutting style on the report: Round brilliant

Certificate IGI LG425065175

Diamond specifications and retailer prices

From £642 GBP
$860 USD
As of October 30, 2026
Save £2,912 GBP (82%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £3,553 GBP at MOH London · As of October 27, 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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG425065175 or 425065175. Listed at 10 retailers as of October 27, 2026, with prices from £642 to £3,553, a £2,912 spread on the same certified stone. MOH London lists it at £3,553. 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
I
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.7°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG425065175
Dimensions7.43 × 7.40 × 4.60 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.43 mm7.40 mm1.56 ctI / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG425065175
Side View
Table 58.5%Crown 35.7°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.0%

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: £3,553 GBP|Low: £642 GBP|High: £3,591 GBP|Avg: £1,613 GBP|+0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 30, 2026
Retailer 2£642 GBP
Retailer 5£952 GBP
Retailer 8£1,036 GBP
Retailer 10£1,066 GBP
Retailer 6£1,105 GBP
Retailer 3£1,290 GBP
Retailer 12£1,528 GBP
Retailer 7£1,749 GBP
Retailer 11£2,058 GBP
Retailer 9£2,070 GBP
Retailer 4£2,472 GBP
MOH London£3,553 GBP

14 data points across 12 retailers

10 retailers£642 GBP to £3,553 GBP

A
Cheapest Retailer
-
£642 GBP
$860 USD
B+
Retailer 2
-
£952 GBP
$1,276 USD
View
B+
Retailer 3
-
£1,036 GBP
$1,388 USD
View
B+
Retailer 4
-
£1,066 GBP
$1,428 USD
View
Final sale: no returns
B+
Retailer 5
-
£1,105 GBP
$1,480 USD
View
Retailer 6
-
£1,105 GBP
$1,480 USD
View
Price last confirmed 19 days ago
B
Retailer 7
-
£1,749 GBP
$2,344 USD
View
B
Retailer 8
-
£2,058 GBP
$2,758 USD
View
B
Retailer 9
-
£2,070 GBP
$2,774 USD
View
Most Expensive
B
MOH London
LG425065175 · Oct 27
£3,553 GBP
View
9 more retailers have this diamond
Prices start from £642 GBPSave up to £2,912 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