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Cushion|Lab Grown|IGI

1.59ct E SI1 Cushion Lab Grown Diamond

GD • E/SI1

Diamond specifications and retailer prices

From £436 GBP
$580 USD
As of October 29, 2026
Save £521 GBP (54%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £957 GBP at Diamond Exchange Canada · As of October 30, 2026
View at Diamond Exchange Canada

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 standard cut grade and certified by IGI. Listed at 2 retailers as of October 29, 2026, with prices from £436 to £957, a £521 spread on the same certified stone. Diamond Exchange Canada lists it at £957. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.59
Carat
E
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions6.76 × 6.74 × 4.60 mm
L/W Ratio1.00
Top View
6.76 mm6.74 mm1.59 ctE / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 60.0%CrownGirdle: SLT-VTKPavilionCulet: NoneDepth

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Oct 29
Current: £957 GBP|Low: £436 GBP|High: £957 GBP|Avg: £696 GBP
Diamond Exchange Canada
Retailer 2
October 17, 2026
Retailer 2£436 GBP
Diamond Exchange Canada£957 GBP

2 data points across 2 retailers

2 retailers£436 GBP to £957 GBP

B+
Cheapest Retailer
-
£436 GBP
$580 USD
Most Expensive
C
Diamond Exchange Canada
1960631829 · Oct 30
£957 GBP
CA$1,770 CAD
View
1 more retailer has this diamond
Prices start from £436 GBPSave up to £521 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.

B+
1.59ct Cushion
£436 GBP