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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 $567 USD
As of October 28, 2026
Save $3,233 USD (85%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $3,800 USD 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 $567 to $3,800, a $3,233 spread on the same certified stone. Brilliant Earth lists it at $3,800. 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

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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: $3,800 USD|Low: $567 USD|High: $3,920 USD|Avg: $1,537 USD|-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$567 USD
Retailer 3$628 USD
Retailer 9$675 USD
Retailer 13$842 USD
Retailer 2$1,043 USD
Retailer 6$1,058 USD
Retailer 7$1,080 USD
Retailer 12$1,424 USD
Retailer 5$1,436 USD
Retailer 10$1,474 USD
Retailer 8$2,626 USD
Retailer 11$2,935 USD
Brilliant Earth$3,800 USD

41 data points across 13 retailers

16 retailers$567 USD to $3,800 USD

A
Cheapest Retailer
-
$567 USD
Final sale: no returns
A
Retailer 2
-
$628 USD
View
Price last confirmed 13 days ago
A
Retailer 3
-
$675 USD
View
A
Retailer 4
-
$842 USD
View
A
Retailer 5
-
$1,043 USD
£822 GBP
View
A
Retailer 6
-
$1,058 USD
€1,008 EUR
View
A
Retailer 7
-
$1,080 USD
ZAR 17,448 ZAR
View
A
Retailer 8
-
$1,424 USD
View
A
Retailer 9
-
$1,436 USD
View
A
Retailer 10
-
$1,474 USD
A$2,268 AUD
View
Price last confirmed 9 days ago
B+
Retailer 11
-
$2,046 USD
View
B+
Retailer 12
-
$2,173 USD
View
B+
Retailer 13
-
$2,626 USD
£2,068 GBP
View
B+
Retailer 14
-
$2,935 USD
View
B
Retailer 15
-
$3,420 USD
View
Price last confirmed 21 days ago
Most Expensive
B
Brilliant Earth
21311889A · Oct 29
$3,800 USD
View
15 more retailers have this diamond
Prices start from $567 USDSave up to $3,233 USD

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
$567 USD