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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 $1,010 NZD
$567 USD
As of October 28, 2026
Save $5,756 NZD (85%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $6,766 NZD 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 $1,010 to $6,766, a $5,756 spread on the same certified stone. Brilliant Earth lists it at $6,766. 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
Colour
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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 28
Current: $6,766 NZD|Low: $1,010 NZD|High: $6,980 NZD|Avg: $2,742 NZD|-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
October 30, 2026
Retailer 4$1,010 NZD
Retailer 3$1,118 NZD
Retailer 8$1,202 NZD
Retailer 12$1,499 NZD
Retailer 2$1,863 NZD
Retailer 5$1,884 NZD
Retailer 6$1,923 NZD
Retailer 11$2,535 NZD
Retailer 9$2,625 NZD
Retailer 7$4,676 NZD
Retailer 10$5,226 NZD
Brilliant Earth$6,766 NZD

41 data points across 12 retailers

16 retailers$1,010 NZD to $6,766 NZD

A
Cheapest Retailer
-
$1,010 NZD
$567 USD
Final sale: no returns
Retailer 2
-
$1,118 NZD
$628 USD
View
Price last confirmed 13 days ago
A
Retailer 3
-
$1,202 NZD
$675 USD
View
A
Retailer 4
-
$1,499 NZD
$842 USD
View
A
Retailer 5
-
$1,863 NZD
£824 GBP
View
A
Retailer 6
-
$1,884 NZD
€1,008 EUR
View
A
Retailer 7
-
$1,923 NZD
ZAR 17,448 ZAR
View
A
Retailer 8
-
$2,535 NZD
$1,424 USD
View
A
Retailer 9
-
$2,557 NZD
$1,436 USD
View
Retailer 10
-
$2,625 NZD
A$2,268 AUD
View
Price last confirmed 9 days ago
B+
Retailer 11
-
$3,642 NZD
$2,046 USD
View
B+
Retailer 12
-
$3,868 NZD
$2,173 USD
View
B+
Retailer 13
-
$4,676 NZD
£2,068 GBP
View
B+
Retailer 14
-
$5,226 NZD
$2,935 USD
View
Retailer 15
-
$6,089 NZD
$3,420 USD
View
Price last confirmed 21 days ago
Most Expensive
B
Brilliant Earth
21311889A · Oct 29
$6,766 NZD
$3,800 USD
View
15 more retailers have this diamond
Prices start from $1,010 NZDSave up to $5,756 NZD

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
$1,010 NZD