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Cushion|Lab Grown|IGI

1.78ct E SI2 Cushion Lab Grown Diamond

ID • E/SI2 • IGI LG528241043

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG528241043

Diamond specifications and retailer prices

From $342 CAD
$244 USD
As of October 29, 2026
Save $1,338 CAD (80%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $1,680 CAD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.78ct lab-grown cushion diamond

This 1.78ct lab-grown cushion sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG528241043 or 528241043. Listed at 10 retailers as of October 29, 2026, with prices from $342 to $1,680, a $1,338 spread on the same certified stone. Brilliant Earth lists it at $1,680. 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

1.78
Carat
E
Color
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle35.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG528241043
Dimensions7.11 × 6.91 × 4.44 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
7.11 mm6.91 mm1.78 ctE / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG528241043
Side View
Table 62.5%Crown 35°Girdle: MED-THKPavilion 35.6°Culet: NoneDepth 64.3%

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 29
Current: $1,680 CAD|Low: $342 CAD|High: $1,736 CAD|Avg: $834 CAD|-3.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 29, 2026
Retailer 4$342 CAD
Retailer 5$378 CAD
Retailer 8$532 CAD
Retailer 3$638 CAD
Retailer 2$699 CAD
Retailer 7$743 CAD
Retailer 10$814 CAD
Retailer 9$854 CAD
Retailer 6$1,516 CAD
Brilliant Earth$1,680 CAD

38 data points across 10 retailers

10 retailers$342 CAD to $1,680 CAD

A
Cheapest Retailer
-
$342 CAD
$244 USD
Final sale: no returns
A
Retailer 2
-
$378 CAD
$270 USD
View
B+
Retailer 3
-
$532 CAD
$380 USD
View
A
Retailer 4
-
$638 CAD
€434 EUR
View
A
Retailer 5
-
$699 CAD
£393 GBP
View
A
Retailer 6
-
$743 CAD
$531 USD
View
A
Retailer 7
-
$814 CAD
$582 USD
View
B+
Retailer 8
-
$854 CAD
$610 USD
View
B
Retailer 9
-
$1,516 CAD
£853 GBP
View
Most Expensive
B
Brilliant Earth
17664345A · Oct 29
$1,680 CAD
$1,200 USD
View
9 more retailers have this diamond
Prices start from $342 CADSave up to $1,338 CAD

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
1.78ct Cushion
$342 CAD