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Cushion|Lab Grown|IGI

1.50ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG678551060

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG678551060

Diamond specifications and retailer prices

From €187 EUR
$209 USD
As of November 1, 2026
Save €824 EUR (82%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: €1,011 EUR at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.5ct lab-grown cushion diamond

This 1.5ct lab-grown cushion sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG678551060 or 678551060. Listed at 7 retailers as of October 31, 2026, with prices from €187 to €1,011, a €824 spread on the same certified stone. Brilliant Earth lists it at €1,011. 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

1.50
Carat
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle36.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG678551060
Dimensions6.66 × 6.55 × 4.12 mm
L/W Ratio1.02
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
6.66 mm6.55 mm1.50 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG678551060
Side View
Table 61.0%Crown 34°Girdle: STK-VTKPavilion 36.9°Culet: NoneDepth 62.9%

Caratlytics Score

How it works →
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: Nov 1
Current: €1,011 EUR|Low: €135 EUR|High: €1,182 EUR|Avg: €596 EUR|-14.4%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 8€187 EUR
Retailer 5€347 EUR
Retailer 9€368 EUR
Retailer 4€377 EUR
Retailer 7€429 EUR
Retailer 6€516 EUR
Retailer 10€584 EUR
Retailer 11€702 EUR
Retailer 2€916 EUR
Brilliant Earth€1,011 EUR
Retailer 3€1,056 EUR

26 data points across 11 retailers

7 retailers€187 EUR to €1,011 EUR

A
Cheapest Retailer
-
€187 EUR
$209 USD
Final sale: no returns
B+
Retailer 2
-
€347 EUR
$388 USD
View
Retailer 3
-
€377 EUR
View
Price last confirmed 7 days ago
A
Retailer 4
-
€429 EUR
$479 USD
View
B+
Retailer 5
-
€516 EUR
$576 USD
View
B
Retailer 6
-
€916 EUR
£806 GBP
View
Most Expensive
B
Brilliant Earth
15325425A · Oct 31
€1,011 EUR
$1,130 USD
View
6 more retailers have this diamond
Prices start from €187 EURSave up to €824 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
1.50ct Cushion
€187 EUR