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Cushion|Lab Grown|IGI

1.65ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG541252029

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG541252029

Diamond specifications and retailer prices

From $320 AUD
$225 USD
As of October 30, 2026
Save $1,787 AUD (85%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $2,107 AUD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.65ct lab-grown cushion diamond

This 1.65ct 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 LG541252029 or 541252029. Listed at 14 retailers as of October 30, 2026, with prices from $320 to $2,107, a $1,787 spread on the same certified stone. Brilliant Earth lists it at $2,107. 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

1.65
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle32.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG541252029
Dimensions6.74 × 6.63 × 4.20 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
6.74 mm6.63 mm1.65 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG541252029
Side View
Table 64.0%Crown 34.5°Girdle: MED-VTKPavilion 32.5°Culet: NoneDepth 63.3%

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: $2,107 AUD|Low: $320 AUD|High: $2,249 AUD|Avg: $930 AUD|-6.3%
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 11$320 AUD
Retailer 9$357 AUD
Retailer 7$484 AUD
Retailer 4$583 AUD
Retailer 2$656 AUD
Retailer 3$723 AUD
Retailer 10$837 AUD
Retailer 5$866 AUD
Retailer 8$1,488 AUD
Retailer 6$1,680 AUD
Brilliant Earth$2,107 AUD

44 data points across 11 retailers

14 retailers$320 AUD to $2,107 AUD

A
Cheapest Retailer
-
$320 AUD
$225 USD
Final sale: no returns
A
Retailer 2
-
$357 AUD
$251 USD
View
B+
Retailer 3
-
$484 AUD
$340 USD
View
A
Retailer 4
-
$583 AUD
€390 EUR
View
A
Retailer 5
-
$656 AUD
£363 GBP
View
A
Retailer 6
-
$723 AUD
$508 USD
View
A
Retailer 7
-
$814 AUD
$572 USD
View
A
Retailer 8
-
$837 AUD
$588 USD
View
A
Retailer 9
-
$866 AUD
$608 USD
View
B+
Retailer 10
-
$1,225 AUD
$860 USD
View
Retailer 11
-
$1,488 AUD
$1,045 USD
View
Price last confirmed 10 days ago
B
Retailer 12
-
$1,680 AUD
£929 GBP
View
B
Retailer 13
-
$1,710 AUD
$1,201 USD
View
Most Expensive
B
Brilliant Earth
10789223A · Oct 31
$2,107 AUD
$1,480 USD
View
13 more retailers have this diamond
Prices start from $320 AUDSave up to $1,787 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
1.65ct Cushion
$320 AUD