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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 €378 EUR
$422 USD
As of November 1, 2026
Save €992 EUR (72%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: €1,369 EUR at Brilliant Earth · As of October 31, 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 31, 2026, with prices from €378 to €1,369, a €992 spread on the same certified stone. Brilliant Earth lists it at €1,369. 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
Color
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: Nov 1
Current: €1,369 EUR|Low: €355 EUR|High: €1,441 EUR|Avg: €650 EUR|-1.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 1, 2026
Retailer 6€378 EUR
Retailer 2€396 EUR
Retailer 3€413 EUR
Retailer 8€428 EUR
Retailer 7€448 EUR
Retailer 5€788 EUR
Retailer 4€1,014 EUR
Brilliant Earth€1,369 EUR

42 data points across 8 retailers

8 retailers€378 EUR to €1,369 EUR

B+
Cheapest Retailer
-
€378 EUR
$422 USD
A
Retailer 2
-
€396 EUR
£348 GBP
View
A
Retailer 3
-
€413 EUR
View
A
Retailer 4
-
€428 EUR
$478 USD
View
A
Retailer 5
-
€448 EUR
$501 USD
View
Retailer 6
-
€788 EUR
$880 USD
View
Price last confirmed 13 days ago
Retailer 7
-
€1,014 EUR
£892 GBP
View
Price last confirmed 7 days ago
Most Expensive
B
Brilliant Earth
13446550A · Oct 31
€1,369 EUR
$1,530 USD
View
7 more retailers have this diamond
Prices start from €378 EURSave up to €992 EUR

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
€378 EUR