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Cushion|Lab Grown|IGI

1.50ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG775629456

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

Certificate IGI LG775629456

Diamond specifications and retailer prices

From €178 EUR
$199 USD
As of November 1, 2026
Save €833 EUR (82%) vs most expensive(unlock to see where)
12 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 LG775629456 or 775629456. Listed at 12 retailers as of October 31, 2026, with prices from €178 to €1,011, a €833 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
SymmetryVery Good
FluorescenceNone
Crown angle32.1°
Pavilion angle34.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG775629456
Dimensions6.71 × 6.60 × 4.07 mm
L/W Ratio1.02
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.71 mm6.60 mm1.50 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG775629456
Side View
Table 65.0%Crown 32.1°Girdle: MED-STKPavilion 34.6°Culet: NoneDepth 61.7%

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: Nov 1
Current: €1,011 EUR|Low: €178 EUR|High: €1,128 EUR|Avg: €483 EUR|-9.6%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 1, 2026
Retailer 10€178 EUR
Retailer 3€209 EUR
Retailer 11€350 EUR
Retailer 5€354 EUR
Retailer 6€366 EUR
Retailer 4€367 EUR
Retailer 8€428 EUR
Retailer 9€430 EUR
Retailer 7€495 EUR
Retailer 12€682 EUR
Retailer 2€921 EUR
Brilliant Earth€1,011 EUR

45 data points across 12 retailers

12 retailers€178 EUR to €1,011 EUR

A
Cheapest Retailer
-
€178 EUR
$199 USD
Final sale: no returns
Retailer 2
-
€209 EUR
$234 USD
View
Price last confirmed 7 days ago
B+
Retailer 3
-
€350 EUR
$391 USD
View
A
Retailer 4
-
€354 EUR
£311 GBP
View
A
Retailer 5
-
€366 EUR
View
Retailer 6
-
€367 EUR
£323 GBP
View
Price last confirmed 18 days ago
A
Retailer 7
-
€428 EUR
$478 USD
View
A
Retailer 8
-
€430 EUR
$480 USD
View
B+
Retailer 9
-
€495 EUR
$553 USD
View
B+
Retailer 10
-
€682 EUR
$762 USD
View
B
Retailer 11
-
€921 EUR
£810 GBP
View
Most Expensive
B
Brilliant Earth
17807477A · Oct 31
€1,011 EUR
$1,130 USD
View
11 more retailers have this diamond
Prices start from €178 EURSave up to €833 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
€178 EUR