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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 €508 EUR
$567 USD
As of October 30, 2026
Save €2,894 EUR (85%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: €3,401 EUR 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 29, 2026, with prices from €508 to €3,401, a €2,894 spread on the same certified stone. Brilliant Earth lists it at €3,401. 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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: €3,401 EUR|Low: €508 EUR|High: €3,509 EUR|Avg: €1,315 EUR|+11.1%
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 31, 2026
Retailer 4€508 EUR
Retailer 3€562 EUR
Retailer 9€604 EUR
Retailer 12€754 EUR
Retailer 6€937 EUR
Retailer 2€942 EUR
Retailer 7€967 EUR
Retailer 11€1,275 EUR
Retailer 5€1,310 EUR
Retailer 8€2,351 EUR
Retailer 10€2,627 EUR
Brilliant Earth€3,401 EUR

40 data points across 12 retailers

16 retailers€508 EUR to €3,401 EUR

A
Cheapest Retailer
-
€508 EUR
$567 USD
Final sale: no returns
Retailer 2
-
€562 EUR
$628 USD
View
Price last confirmed 16 days ago
A
Retailer 3
-
€604 EUR
$675 USD
View
A
Retailer 4
-
€754 EUR
$842 USD
View
A
Retailer 5
-
€937 EUR
£824 GBP
View
A
Retailer 6
-
€942 EUR
View
A
Retailer 7
-
€967 EUR
ZAR 17,448 ZAR
View
A
Retailer 8
-
€1,275 EUR
$1,424 USD
View
A
Retailer 9
-
€1,285 EUR
$1,436 USD
View
A
Retailer 10
-
€1,310 EUR
A$2,251 AUD
View
B+
Retailer 11
-
€1,831 EUR
$2,046 USD
View
B+
Retailer 12
-
€1,945 EUR
$2,173 USD
View
B+
Retailer 13
-
€2,351 EUR
£2,068 GBP
View
B+
Retailer 14
-
€2,627 EUR
$2,935 USD
View
Retailer 15
-
€3,061 EUR
$3,420 USD
View
Price last confirmed 23 days ago
Most Expensive
B
Brilliant Earth
21311889A · Oct 29
€3,401 EUR
$3,800 USD
View
15 more retailers have this diamond
Prices start from €508 EURSave up to €2,894 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
1.78ct Cushion
€508 EUR