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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 $387 NZD
$218 USD
As of November 1, 2026
Save $1,742 NZD (82%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $2,129 NZD at Brilliant Earth · As of October 31, 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 31, 2026, with prices from $387 to $2,129, a $1,742 spread on the same certified stone. Brilliant Earth lists it at $2,129. 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: Nov 1
Current: $2,129 NZD|Low: $387 NZD|High: $2,413 NZD|Avg: $1,088 NZD|-11.8%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 1, 2026
Retailer 8$387 NZD
Retailer 6$582 NZD
Retailer 4$708 NZD
Retailer 3$788 NZD
Retailer 9$869 NZD
Retailer 7$1,026 NZD
Retailer 5$1,040 NZD
Retailer 2$2,017 NZD
Brilliant Earth$2,129 NZD

42 data points across 9 retailers

12 retailers$387 NZD to $2,129 NZD

A
Cheapest Retailer
-
$387 NZD
$218 USD
Final sale: no returns
B+
Retailer 2
-
$582 NZD
$328 USD
View
A
Retailer 3
-
$708 NZD
€380 EUR
View
A
Retailer 4
-
$788 NZD
£350 GBP
View
A
Retailer 5
-
$869 NZD
$490 USD
View
A
Retailer 6
-
$949 NZD
$535 USD
View
B+
Retailer 7
-
$1,026 NZD
$578 USD
View
A
Retailer 8
-
$1,040 NZD
$586 USD
View
B
Retailer 9
-
$1,482 NZD
$835 USD
View
B
Retailer 10
-
$2,017 NZD
£895 GBP
View
B
Retailer 11
-
$2,095 NZD
$1,181 USD
View
Most Expensive
B
Brilliant Earth
10789149A · Oct 31
$2,129 NZD
$1,200 USD
View
11 more retailers have this diamond
Prices start from $387 NZDSave up to $1,742 NZD

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
$387 NZD