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Cushion|Lab Grown|IGI

1.66ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG532262653

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG532262653

Diamond specifications and retailer prices

From $431 AUD
$302 USD
As of November 1, 2026
Save $1,838 AUD (81%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $2,269 AUD at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 1.66ct lab-grown cushion diamond

This 1.66ct 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 LG532262653 or 532262653. Listed at 14 retailers as of November 1, 2026, with prices from $431 to $2,269, a $1,838 spread on the same certified stone. Brilliant Earth lists it at $2,269. 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

1.66
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle38.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG532262653
Dimensions7.05 × 6.85 × 4.46 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
7.05 mm6.85 mm1.66 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG532262653
Side View
Table 65.0%Crown 35.4°Girdle: MED-THKPavilion 38.9°Culet: NoneDepth 65.1%

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: $2,269 AUD|Low: $431 AUD|High: $2,283 AUD|Avg: $1,020 AUD|-0.6%
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 2, 2026
Retailer 3$431 AUD
Retailer 11$477 AUD
Retailer 7$531 AUD
Retailer 12$639 AUD
Retailer 9$642 AUD
Retailer 8$838 AUD
Retailer 6$848 AUD
Retailer 4$859 AUD
Retailer 5$1,220 AUD
Retailer 10$1,541 AUD
Retailer 2$1,912 AUD
Brilliant Earth$2,269 AUD

42 data points across 12 retailers

14 retailers$431 AUD to $2,269 AUD

A
Cheapest Retailer
-
$431 AUD
$302 USD
Final sale: no returns
Retailer 2
-
$477 AUD
$334 USD
View
Price last confirmed 8 days ago
A
Retailer 3
-
$531 AUD
£293 GBP
View
B+
Retailer 4
-
$639 AUD
$448 USD
View
A
Retailer 5
-
$642 AUD
$450 USD
View
A
Retailer 6
-
$838 AUD
£462 GBP
View
A
Retailer 7
-
$848 AUD
€566 EUR
View
B+
Retailer 8
-
$859 AUD
$602 USD
View
B+
Retailer 9
-
$859 AUD
$602 USD
View
B+
Retailer 10
-
$1,220 AUD
$855 USD
View
Retailer 11
-
$1,541 AUD
$1,080 USD
View
Price last confirmed 12 days ago
B
Retailer 12
-
$1,606 AUD
$1,125 USD
View
B
Retailer 13
-
$1,912 AUD
£1,055 GBP
View
Most Expensive
B
Brilliant Earth
11259540A · Nov 2
$2,269 AUD
$1,590 USD
View
13 more retailers have this diamond
Prices start from $431 AUDSave up to $1,838 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
1.66ct Cushion
$431 AUD