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Cushion|Lab Grown|IGI

1.66ct E IF Cushion Lab Grown Diamond

ID • E/IF • IGI LG729569332

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG729569332

Diamond specifications and retailer prices

From $704 USD
As of November 1, 2026
Save $2,586 USD (79%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $3,290 USD at Brilliant Earth · As of October 31, 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 E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG729569332 or 729569332. Listed at 20 retailers as of October 31, 2026, with prices from $704 to $3,290, a $2,586 spread on the same certified stone. Brilliant Earth lists it at $3,290. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.66
Carat
E
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.8°
Pavilion angle40°
OriginLab Grown
Grading LabIGI
CertificateIGI LG729569332
Dimensions7.93 × 6.21 × 4.31 mm
L/W Ratio1.28
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
7.93 mm6.21 mm1.66 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG729569332
Side View
Table 58.0%Crown 35.8°Girdle: MED-VTKPavilion 40°Culet: NoneDepth 69.4%

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: $3,290 USD|Low: $704 USD|High: $3,360 USD|Avg: $1,688 USD|-2.1%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
November 1, 2026
Retailer 11$704 USD
Retailer 4$731 USD
Retailer 16$900 USD
Retailer 7$982 USD
Retailer 8$1,048 USD
Retailer 10$1,187 USD
Retailer 9$1,214 USD
Retailer 14$1,343 USD
Retailer 12$1,662 USD
Retailer 13$1,819 USD
Retailer 15$1,895 USD
Retailer 6$2,271 USD
Retailer 3$2,355 USD
Retailer 5$2,466 USD
Retailer 2$3,078 USD
Brilliant Earth$3,290 USD

43 data points across 16 retailers

20 retailers$704 USD to $3,290 USD

A
Cheapest Retailer
-
$704 USD
Final sale: no returns
Retailer 2
-
$731 USD
View
Price last confirmed 16 days ago
A
Retailer 3
-
$858 USD
HK$6,700 HKD
View
A
Retailer 4
-
$900 USD
View
A
Retailer 5
-
$982 USD
View
A
Retailer 6
-
$1,048 USD
View
A
Retailer 7
-
$1,187 USD
€1,130 EUR
View
A
Retailer 8
-
$1,214 USD
£956 GBP
View
A
Retailer 9
-
$1,317 USD
View
A
Retailer 10
-
$1,343 USD
ZAR 21,689 ZAR
View
B+
Retailer 11
-
$1,662 USD
View
B+
Retailer 12
-
$1,819 USD
A$2,799 AUD
View
Retailer 13
-
$1,895 USD
View
Price last confirmed 11 days ago
B+
Retailer 14
-
$2,271 USD
£1,788 GBP
View
B+
Retailer 15
-
$2,355 USD
View
B+
Retailer 16
-
$2,466 USD
SGD 3,332 SGD
View
B
Retailer 17
-
$2,522 USD
View
B
Retailer 18
-
$2,566 USD
View
B
Retailer 19
-
$3,078 USD
£2,424 GBP
View
Most Expensive
B
Brilliant Earth
15964172A · Oct 31
$3,290 USD
View
19 more retailers have this diamond
Prices start from $704 USDSave up to $2,586 USD

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
$704 USD