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Radiant|Lab Grown|IGI

1.56ct E SI1 Radiant Lab Grown Diamond

ID • E/SI1 • IGI LG537215993

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

Certificate IGI LG537215993

Diamond specifications and retailer prices

From £134 GBP
$178 USD
As of October 27, 2026
Save £707 GBP (84%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £841 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG537215993 or 537215993. Listed at 18 retailers as of October 27, 2026, with prices from £134 to £841, a £707 spread on the same certified stone. Brilliant Earth lists it at £841. 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
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.2°
Pavilion angle34.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG537215993
Dimensions8.39 × 5.66 × 3.80 mm
L/W Ratio1.48
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
8.39 mm5.66 mm1.56 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG537215993
Side View
Table 61.0%Crown 32.2°Girdle: MED-STKPavilion 34.3°Culet: NoneDepth 67.1%

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 27
Current: £841 GBP|Low: £128 GBP|High: £841 GBP|Avg: £378 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
October 30, 2026
Retailer 15£134 GBP
Retailer 5£166 GBP
Retailer 7£170 GBP
Retailer 10£170 GBP
Retailer 2£218 GBP
Retailer 13£278 GBP
Retailer 4£294 GBP
Retailer 8£307 GBP
Retailer 6£419 GBP
Retailer 14£426 GBP
Retailer 3£533 GBP
Retailer 9£587 GBP
Retailer 12£650 GBP
Retailer 11£779 GBP
Brilliant Earth£841 GBP

42 data points across 15 retailers

18 retailers£134 GBP to £841 GBP

A
Cheapest Retailer
-
£134 GBP
$178 USD
A
Retailer 2
-
£155 GBP
$207 USD
View
A
Retailer 3
-
£166 GBP
$221 USD
View
A
Retailer 4
-
£170 GBP
$226 USD
View
Final sale: no returns
A
Retailer 5
-
£170 GBP
$226 USD
View
A
Retailer 6
-
£218 GBP
View
A
Retailer 7
-
£278 GBP
€352 EUR
View
B+
Retailer 8
-
£294 GBP
$391 USD
View
A
Retailer 9
-
£307 GBP
View
B+
Retailer 10
-
£354 GBP
$472 USD
View
B+
Retailer 11
-
£419 GBP
$558 USD
View
B+
Retailer 12
-
£426 GBP
$567 USD
View
B+
Retailer 13
-
£533 GBP
$710 USD
View
B+
Retailer 14
-
£550 GBP
View
B+
Retailer 15
-
£587 GBP
$782 USD
View
Retailer 16
-
£650 GBP
$865 USD
View
Price last confirmed 11 days ago
B
Retailer 17
-
£779 GBP
View
Most Expensive
B
Brilliant Earth
14996947A · Oct 29
£841 GBP
$1,120 USD
View
17 more retailers have this diamond
Prices start from £134 GBPSave up to £707 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
£134 GBP