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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 $218 USD
As of October 30, 2026
Save $982 USD (82%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,200 USD 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 $218 to $1,200, a $982 spread on the same certified stone. Brilliant Earth lists it at $1,200. 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
Color
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: $1,200 USD|Low: $218 USD|High: $1,360 USD|Avg: $615 USD|-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$218 USD
Retailer 6$328 USD
Retailer 4$401 USD
Retailer 3$443 USD
Retailer 9$490 USD
Retailer 7$578 USD
Retailer 2$586 USD
Retailer 5$1,143 USD
Brilliant Earth$1,200 USD

43 data points across 9 retailers

12 retailers$218 USD to $1,200 USD

A
Cheapest Retailer
-
$218 USD
Final sale: no returns
B+
Retailer 2
-
$328 USD
View
A
Retailer 3
-
$401 USD
€382 EUR
View
A
Retailer 4
-
$443 USD
£349 GBP
View
A
Retailer 5
-
$490 USD
View
A
Retailer 6
-
$535 USD
View
B+
Retailer 7
-
$578 USD
View
B+
Retailer 8
-
$586 USD
View
B
Retailer 9
-
$835 USD
View
B
Retailer 10
-
$1,143 USD
£900 GBP
View
B
Retailer 11
-
$1,181 USD
View
Most Expensive
B
Brilliant Earth
10789149A · Oct 30
$1,200 USD
View
11 more retailers have this diamond
Prices start from $218 USDSave up to $982 USD

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
$218 USD