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Cushion|Lab Grown|IGI

1.78ct E IF Cushion Lab Grown Diamond

ID • E/IF • IGI LG674551669

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG674551669

Diamond specifications and retailer prices

From $794 CAD
$567 USD
As of October 28, 2026
Save $4,525 CAD (85%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $5,318 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 IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG674551669 or 674551669. Listed at 16 retailers as of October 28, 2026, with prices from $794 to $5,318, a $4,525 spread on the same certified stone. Brilliant Earth lists it at $5,318. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.78
Carat
E
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.5°
Pavilion angle38.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG674551669
Dimensions8.20 × 6.42 × 4.48 mm
L/W Ratio1.28
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
8.20 mm6.42 mm1.78 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG674551669
Side View
Table 61.0%Crown 32.5°Girdle: MED-STKPavilion 38.5°Culet: NoneDepth 69.8%

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: $5,318 CAD|Low: $794 CAD|High: $5,486 CAD|Avg: $2,143 CAD|-3.1%
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 4$794 CAD
Retailer 3$879 CAD
Retailer 9$945 CAD
Retailer 13$1,178 CAD
Retailer 2$1,460 CAD
Retailer 6$1,481 CAD
Retailer 7$1,512 CAD
Retailer 12$1,993 CAD
Retailer 5$2,010 CAD
Retailer 10$2,063 CAD
Retailer 8$3,676 CAD
Retailer 11$4,108 CAD
Brilliant Earth$5,318 CAD

40 data points across 13 retailers

16 retailers$794 CAD to $5,318 CAD

A
Cheapest Retailer
-
$794 CAD
$567 USD
Final sale: no returns
Retailer 2
-
$879 CAD
$628 USD
View
Price last confirmed 13 days ago
A
Retailer 3
-
$945 CAD
$675 USD
View
A
Retailer 4
-
$1,178 CAD
$842 USD
View
A
Retailer 5
-
$1,460 CAD
£822 GBP
View
A
Retailer 6
-
$1,481 CAD
€1,008 EUR
View
A
Retailer 7
-
$1,512 CAD
ZAR 17,448 ZAR
View
A
Retailer 8
-
$1,993 CAD
$1,424 USD
View
A
Retailer 9
-
$2,010 CAD
$1,436 USD
View
Retailer 10
-
$2,063 CAD
A$2,268 AUD
View
Price last confirmed 9 days ago
B+
Retailer 11
-
$2,863 CAD
$2,046 USD
View
B+
Retailer 12
-
$3,041 CAD
$2,173 USD
View
B+
Retailer 13
-
$3,676 CAD
£2,068 GBP
View
B+
Retailer 14
-
$4,108 CAD
$2,935 USD
View
Retailer 15
-
$4,787 CAD
$3,420 USD
View
Price last confirmed 21 days ago
Most Expensive
B
Brilliant Earth
21311889A · Oct 29
$5,318 CAD
$3,800 USD
View
15 more retailers have this diamond
Prices start from $794 CADSave up to $4,525 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
$794 CAD