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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 €219 EUR
$244 USD
As of October 29, 2026
Save €859 EUR (80%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: €1,078 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG528241043 or 528241043. Listed at 10 retailers as of October 29, 2026, with prices from €219 to €1,078, a €859 spread on the same certified stone. Brilliant Earth lists it at €1,078. 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
Colour
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 29
Current: €1,078 EUR|Low: €219 EUR|High: €1,114 EUR|Avg: €538 EUR|-3.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 4€219 EUR
Retailer 5€243 EUR
Retailer 8€341 EUR
Retailer 3€409 EUR
Retailer 2€450 EUR
Retailer 7€477 EUR
Retailer 10€523 EUR
Retailer 9€548 EUR
Retailer 6€973 EUR
Brilliant Earth€1,078 EUR

39 data points across 10 retailers

10 retailers€219 EUR to €1,078 EUR

A
Cheapest Retailer
-
€219 EUR
$244 USD
Final sale: no returns
A
Retailer 2
-
€243 EUR
$270 USD
View
B+
Retailer 3
-
€341 EUR
$380 USD
View
A
Retailer 4
-
€409 EUR
View
A
Retailer 5
-
€450 EUR
£394 GBP
View
A
Retailer 6
-
€477 EUR
$531 USD
View
A
Retailer 7
-
€523 EUR
$582 USD
View
B+
Retailer 8
-
€548 EUR
$610 USD
View
B
Retailer 9
-
€973 EUR
£853 GBP
View
Most Expensive
B
Brilliant Earth
17664345A · Oct 29
€1,078 EUR
$1,200 USD
View
9 more retailers have this diamond
Prices start from €219 EURSave up to €859 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
€219 EUR