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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 $279 SGD
$218 USD
As of October 30, 2026
Save $1,255 SGD (82%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,534 SGD 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 $279 to $1,534, a $1,255 spread on the same certified stone. Brilliant Earth lists it at $1,534. 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

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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: $1,534 SGD|Low: $279 SGD|High: $1,739 SGD|Avg: $786 SGD|-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$279 SGD
Retailer 6$419 SGD
Retailer 2$510 SGD
Retailer 3$563 SGD
Retailer 9$626 SGD
Retailer 7$739 SGD
Retailer 4$749 SGD
Retailer 5$1,461 SGD
Brilliant Earth$1,534 SGD

43 data points across 9 retailers

12 retailers$279 SGD to $1,534 SGD

A
Cheapest Retailer
-
$279 SGD
$218 USD
Final sale: no returns
B+
Retailer 2
-
$419 SGD
$328 USD
View
A
Retailer 3
-
$510 SGD
€380 EUR
View
A
Retailer 4
-
$563 SGD
£347 GBP
View
A
Retailer 5
-
$626 SGD
$490 USD
View
A
Retailer 6
-
$684 SGD
$535 USD
View
B+
Retailer 7
-
$739 SGD
$578 USD
View
A
Retailer 8
-
$749 SGD
$586 USD
View
B
Retailer 9
-
$1,068 SGD
$835 USD
View
B
Retailer 10
-
$1,461 SGD
£900 GBP
View
B
Retailer 11
-
$1,510 SGD
$1,181 USD
View
Most Expensive
B
Brilliant Earth
10789149A · Oct 30
$1,534 SGD
$1,200 USD
View
11 more retailers have this diamond
Prices start from $279 SGDSave up to $1,255 SGD

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
$279 SGD