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Cushion|Lab Grown|IGI

1.56ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG683597087

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG683597087

Diamond specifications and retailer prices

From $601 AUD
$422 USD
As of October 30, 2026
Save $1,620 AUD (73%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $2,221 AUD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.56ct lab-grown cushion diamond

This 1.56ct 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 LG683597087 or 683597087. Listed at 8 retailers as of October 29, 2026, with prices from $601 to $2,221, a $1,620 spread on the same certified stone. Brilliant Earth lists it at $2,221. 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

1.56
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.2°
Pavilion angle37.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG683597087
Dimensions6.60 × 6.58 × 4.47 mm
L/W Ratio1.00
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
6.60 mm6.58 mm1.56 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG683597087
Side View
Table 62.0%Crown 37.2°Girdle: THN-MEDPavilion 37.1°Culet: NoneDepth 67.9%

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: $2,221 AUD|Low: $565 AUD|High: $2,292 AUD|Avg: $1,024 AUD
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 30, 2026
Retailer 6$601 AUD
Retailer 2$629 AUD
Retailer 3$659 AUD
Retailer 8$680 AUD
Retailer 7$713 AUD
Retailer 5$1,253 AUD
Retailer 4$1,612 AUD
Brilliant Earth$2,221 AUD

42 data points across 8 retailers

8 retailers$601 AUD to $2,221 AUD

B+
Cheapest Retailer
-
$601 AUD
$422 USD
A
Retailer 2
-
$629 AUD
£348 GBP
View
A
Retailer 3
-
$659 AUD
€441 EUR
View
A
Retailer 4
-
$680 AUD
$478 USD
View
A
Retailer 5
-
$713 AUD
$501 USD
View
Retailer 6
-
$1,253 AUD
$880 USD
View
Price last confirmed 11 days ago
B
Retailer 7
-
$1,612 AUD
£892 GBP
View
Most Expensive
B
Brilliant Earth
13446550A · Oct 29
$2,221 AUD
$1,560 USD
View
7 more retailers have this diamond
Prices start from $601 AUDSave up to $1,620 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
1.56ct Cushion
$601 AUD