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Cushion|Lab Grown|IGI

1.57ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG831623571

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG831623571

Diamond specifications and retailer prices

From $392 NZD
$220 USD
As of October 28, 2026
Save $2,297 NZD (85%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $2,689 NZD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.57ct lab-grown cushion diamond

This 1.57ct lab-grown cushion sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG831623571 or 831623571. Listed at 13 retailers as of October 28, 2026, with prices from $392 to $2,689, a $2,297 spread on the same certified stone. Brilliant Earth lists it at $2,689. 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

1.57
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.1°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG831623571
Dimensions7.65 × 6.13 × 4.09 mm
L/W Ratio1.25
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.65 mm6.13 mm1.57 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG831623571
Side View
Table 64.0%Crown 33.1°Girdle: STK-VTKPavilion 40.7°Culet: NoneDepth 66.7%

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 28
Current: $2,689 NZD|Low: $363 NZD|High: $2,689 NZD|Avg: $1,065 NZD|+6.3%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 29, 2026
Retailer 13$392 NZD
Retailer 11$433 NZD
Retailer 8$558 NZD
Retailer 9$584 NZD
Retailer 6$729 NZD
Retailer 2$792 NZD
Retailer 12$860 NZD
Retailer 10$896 NZD
Retailer 3$1,489 NZD
Retailer 5$1,576 NZD
Retailer 7$2,028 NZD
Retailer 4$2,104 NZD
Brilliant Earth$2,689 NZD

39 data points across 13 retailers

13 retailers$392 NZD to $2,689 NZD

A
Cheapest Retailer
-
$392 NZD
$220 USD
Final sale: no returns
Retailer 2
-
$433 NZD
$243 USD
View
Price last confirmed 13 days ago
Retailer 3
-
$558 NZD
£247 GBP
View
Price last confirmed 13 days ago
B+
Retailer 4
-
$584 NZD
$328 USD
View
A
Retailer 5
-
$729 NZD
€390 EUR
View
A
Retailer 6
-
$792 NZD
£350 GBP
View
A
Retailer 7
-
$860 NZD
$483 USD
View
A
Retailer 8
-
$896 NZD
$503 USD
View
B+
Retailer 9
-
$1,489 NZD
$836 USD
View
Retailer 10
-
$1,576 NZD
$885 USD
View
Price last confirmed 29 days ago
B
Retailer 11
-
$2,028 NZD
£897 GBP
View
B
Retailer 12
-
$2,104 NZD
$1,182 USD
View
Most Expensive
B
Brilliant Earth
21679088A · Oct 29
$2,689 NZD
$1,510 USD
View
12 more retailers have this diamond
Prices start from $392 NZDSave up to $2,297 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
1.57ct Cushion
$392 NZD