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Cushion|Lab Grown|IGI

1.59ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1

Diamond specifications and retailer prices

From £252 GBP
As of October 30, 2026
Save £582 GBP (70%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £834 GBP at Blue Nile · As of October 31, 2026
View at Blue Nile

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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI. Listed at 2 retailers as of October 30, 2026, with prices from £252 to £834, a £582 spread on the same certified stone. Blue Nile lists it at £834. 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
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions6.69 × 6.61 × 0.00 mm
L/W Ratio1.01
Top View
6.69 mm6.61 mm1.59 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 64.5%CrownGirdle: MED-STKPavilionCulet: NoneDepth 67.5%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 30
Current: £834 GBP|Low: £89 GBP|High: £834 GBP|Avg: £376 GBP
Blue Nile
Retailer 2
Retailer 3
October 30, 2026
Retailer 3£89 GBP
Retailer 2£252 GBP
Blue Nile£834 GBP

37 data points across 3 retailers

2 retailers£252 GBP to £834 GBP

A
Cheapest Retailer
-
£252 GBP
Most Expensive
B
Blue Nile
21052784 · Oct 31
£834 GBP
$1,118 USD
View
1 more retailer has this diamond
Prices start from £252 GBPSave up to £582 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
£252 GBP