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Cushion|Lab Grown|IGI

1.59ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG520211712

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG520211712

Diamond specifications and retailer prices

From $310 AUD
$218 USD
As of October 30, 2026
Save $1,398 AUD (82%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $1,708 AUD 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 LG520211712 or 520211712. Listed at 13 retailers as of October 30, 2026, with prices from $310 to $1,708, a $1,398 spread on the same certified stone. Brilliant Earth lists it at $1,708. 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
Crown angle38°
Pavilion angle31.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG520211712
Dimensions6.53 × 6.34 × 4.23 mm
L/W Ratio1.03
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
6.53 mm6.34 mm1.59 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG520211712
Side View
Table 60.5%Crown 38°Girdle: STK-VTKPavilion 31.3°Culet: NoneDepth 66.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $1,708 AUD|Low: $310 AUD|High: $1,936 AUD|Avg: $915 AUD|-11.8%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 9$310 AUD
Retailer 6$467 AUD
Retailer 2$568 AUD
Retailer 3$627 AUD
Retailer 10$697 AUD
Retailer 8$823 AUD
Retailer 4$834 AUD
Retailer 7$1,424 AUD
Retailer 5$1,627 AUD
Brilliant Earth$1,708 AUD

44 data points across 10 retailers

13 retailers$310 AUD to $1,708 AUD

A
Cheapest Retailer
-
$310 AUD
$218 USD
Final sale: no returns
B+
Retailer 2
-
$467 AUD
$328 USD
View
A
Retailer 3
-
$568 AUD
€380 EUR
View
A
Retailer 4
-
$627 AUD
£347 GBP
View
A
Retailer 5
-
$697 AUD
$490 USD
View
A
Retailer 6
-
$762 AUD
$535 USD
View
B+
Retailer 7
-
$823 AUD
$578 USD
View
A
Retailer 8
-
$834 AUD
$586 USD
View
B
Retailer 9
-
$1,189 AUD
$835 USD
View
Retailer 10
-
$1,424 AUD
$1,000 USD
View
Price last confirmed 10 days ago
B
Retailer 11
-
$1,627 AUD
£900 GBP
View
B
Retailer 12
-
$1,681 AUD
$1,181 USD
View
Most Expensive
B
Brilliant Earth
10788323A · Oct 30
$1,708 AUD
$1,200 USD
View
12 more retailers have this diamond
Prices start from $310 AUDSave up to $1,398 AUD

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
$310 AUD