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Cushion|Lab Grown|IGI

1.59ct E SI1 Cushion Lab Grown Diamond

EX • E/SI1 • IGI LG455010380

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG455010380

Diamond specifications and retailer prices

From £301 GBP
$401 USD
As of October 27, 2026
Save £1,494 GBP (83%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £1,795 GBP at Do Amore Diamonds · As of October 29, 2026
View at Do Amore Diamonds

About this 1.59ct lab-grown cushion diamond

This 1.59ct lab-grown cushion 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 LG455010380 or 455010380. Listed at 9 retailers as of October 27, 2026, with prices from £301 to £1,795, a £1,494 spread on the same certified stone. Do Amore Diamonds lists it at £1,795. 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

1.59
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.3°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG455010380
Dimensions6.76 × 6.74 × 4.60 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Chemical Vapor Deposition (CVD) laboratory grown diamond is classified as Type IIa.
Top View
6.76 mm6.74 mm1.59 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG455010380
Side View
Table 60.0%Crown 35.3°Girdle: STK-VTKPavilion 40.8°Culet: NoneDepth 68.2%

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 27
Current: £1,795 GBP|Low: £301 GBP|High: £1,795 GBP|Avg: £737 GBP
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 29, 2026
Retailer 4£301 GBP
Retailer 5£415 GBP
Retailer 2£489 GBP
Retailer 7£668 GBP
Retailer 8£898 GBP
Retailer 6£1,012 GBP
Retailer 3£1,114 GBP
Do Amore Diamonds£1,795 GBP

34 data points across 8 retailers

9 retailers£301 GBP to £1,795 GBP

A
Cheapest Retailer
-
£301 GBP
$401 USD
A
Retailer 2
-
£368 GBP
$490 USD
View
B+
Retailer 3
-
£415 GBP
$553 USD
View
B+
Retailer 4
-
£489 GBP
View
B+
Retailer 5
-
£668 GBP
$889 USD
View
B
Retailer 6
-
£898 GBP
$1,196 USD
View
B
Retailer 7
-
£1,012 GBP
$1,348 USD
View
B
Retailer 8
-
£1,114 GBP
View
Most Expensive
B
Do Amore Diamonds
27-363F4265B · Oct 29
£1,795 GBP
$2,390 USD
View
8 more retailers have this diamond
Prices start from £301 GBPSave up to £1,494 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
1.59ct Cushion
£301 GBP