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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 $283 AUD
$199 USD
As of November 1, 2026
Save $1,325 AUD (82%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,609 AUD 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 $283 to $1,609, a $1,325 spread on the same certified stone. Brilliant Earth lists it at $1,609. 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
Colour
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

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: $1,609 AUD|Low: $283 AUD|High: $1,794 AUD|Avg: $769 AUD|-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$283 AUD
Retailer 3$333 AUD
Retailer 11$557 AUD
Retailer 5$563 AUD
Retailer 6$581 AUD
Retailer 4$584 AUD
Retailer 8$680 AUD
Retailer 9$683 AUD
Retailer 7$787 AUD
Retailer 12$1,085 AUD
Retailer 2$1,464 AUD
Brilliant Earth$1,609 AUD

44 data points across 12 retailers

12 retailers$283 AUD to $1,609 AUD

A
Cheapest Retailer
-
$283 AUD
$199 USD
Final sale: no returns
Retailer 2
-
$333 AUD
$234 USD
View
Price last confirmed 7 days ago
B+
Retailer 3
-
$557 AUD
$391 USD
View
A
Retailer 4
-
$563 AUD
£311 GBP
View
A
Retailer 5
-
$581 AUD
€389 EUR
View
Retailer 6
-
$584 AUD
£323 GBP
View
Price last confirmed 18 days ago
A
Retailer 7
-
$680 AUD
$478 USD
View
A
Retailer 8
-
$683 AUD
$480 USD
View
B+
Retailer 9
-
$787 AUD
$553 USD
View
B+
Retailer 10
-
$1,085 AUD
$762 USD
View
B
Retailer 11
-
$1,464 AUD
£810 GBP
View
Most Expensive
B
Brilliant Earth
17807477A · Oct 31
$1,609 AUD
$1,130 USD
View
11 more retailers have this diamond
Prices start from $283 AUDSave up to $1,325 AUD

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
$283 AUD