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Cushion|Lab Grown|IGI

1.59ct D SI1 Cushion Lab Grown Diamond

EX • D/SI1 • IGI LG539216557

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG539216557

Diamond specifications and retailer prices

From £163 GBP
$218 USD
As of October 30, 2026
Save £733 GBP (82%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £896 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

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 LG539216557 or 539216557. Listed at 12 retailers as of October 30, 2026, with prices from £163 to £896, a £733 spread on the same certified stone. Brilliant Earth lists it at £896. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.3°
Pavilion angle32.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG539216557
Dimensions6.48 × 6.35 × 4.35 mm
L/W Ratio1.02
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.48 mm6.35 mm1.59 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG539216557
Side View
Table 57.5%Crown 37.3°Girdle: STK-VTKPavilion 32.9°Culet: NoneDepth 68.5%

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 30
Current: £896 GBP|Low: £163 GBP|High: £1,015 GBP|Avg: £459 GBP|-11.8%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 31, 2026
Retailer 8£163 GBP
Retailer 6£245 GBP
Retailer 4£299 GBP
Retailer 2£329 GBP
Retailer 9£365 GBP
Retailer 7£431 GBP
Retailer 3£437 GBP
Retailer 5£853 GBP
Brilliant Earth£896 GBP

43 data points across 9 retailers

12 retailers£163 GBP to £896 GBP

A
Cheapest Retailer
-
£163 GBP
$218 USD
Final sale: no returns
B+
Retailer 2
-
£245 GBP
$328 USD
View
A
Retailer 3
-
£299 GBP
€382 EUR
View
A
Retailer 4
-
£329 GBP
View
A
Retailer 5
-
£365 GBP
$490 USD
View
A
Retailer 6
-
£399 GBP
$535 USD
View
B+
Retailer 7
-
£431 GBP
$578 USD
View
A
Retailer 8
-
£437 GBP
$586 USD
View
B
Retailer 9
-
£623 GBP
$835 USD
View
B
Retailer 10
-
£853 GBP
View
B
Retailer 11
-
£881 GBP
$1,181 USD
View
Most Expensive
B
Brilliant Earth
10789149A · Oct 30
£896 GBP
$1,200 USD
View
11 more retailers have this diamond
Prices start from £163 GBPSave up to £733 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
£163 GBP