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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 €236 EUR
$264 USD
As of October 30, 2026
Save €838 EUR (78%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: €1,074 EUR at Brilliant Earth · As of October 31, 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 11 retailers as of October 30, 2026, with prices from €236 to €1,074, a €838 spread on the same certified stone. Brilliant Earth lists it at €1,074. 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

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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 30
Current: €1,074 EUR|Low: €218 EUR|High: €1,110 EUR|Avg: €535 EUR|-3.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 31, 2026
Retailer 6€236 EUR
Retailer 7€242 EUR
Retailer 10€340 EUR
Retailer 2€405 EUR
Retailer 4€445 EUR
Retailer 9€475 EUR
Retailer 3€521 EUR
Retailer 11€546 EUR
Retailer 5€623 EUR
Retailer 8€970 EUR
Brilliant Earth€1,074 EUR

38 data points across 11 retailers

11 retailers€236 EUR to €1,074 EUR

A
Cheapest Retailer
-
€236 EUR
$264 USD
Final sale: no returns
A
Retailer 2
-
€242 EUR
$270 USD
View
B+
Retailer 3
-
€340 EUR
$380 USD
View
A
Retailer 4
-
€405 EUR
View
A
Retailer 5
-
€445 EUR
£391 GBP
View
A
Retailer 6
-
€475 EUR
$531 USD
View
A
Retailer 7
-
€521 EUR
$582 USD
View
B+
Retailer 8
-
€546 EUR
$610 USD
View
B+
Retailer 9
-
€623 EUR
$696 USD
View
B
Retailer 10
-
€970 EUR
£853 GBP
View
Most Expensive
B
Brilliant Earth
17664345A · Oct 31
€1,074 EUR
$1,200 USD
View
10 more retailers have this diamond
Prices start from €236 EURSave up to €838 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
€236 EUR