CaratHunter
Plans
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 $302 USD
As of November 1, 2026
Save $1,288 USD (81%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $1,590 USD 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 $302 to $1,590, a $1,288 spread on the same certified stone. Brilliant Earth lists it at $1,590. 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
Color
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

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $1,590 USD|Low: $302 USD|High: $1,600 USD|Avg: $714 USD|-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$302 USD
Retailer 11$334 USD
Retailer 6$372 USD
Retailer 12$448 USD
Retailer 9$450 USD
Retailer 7$587 USD
Retailer 5$594 USD
Retailer 4$602 USD
Retailer 2$855 USD
Retailer 10$1,080 USD
Retailer 8$1,346 USD
Brilliant Earth$1,590 USD

43 data points across 12 retailers

14 retailers$302 USD to $1,590 USD

A
Cheapest Retailer
-
$302 USD
Final sale: no returns
Retailer 2
-
$334 USD
View
Price last confirmed 8 days ago
A
Retailer 3
-
$372 USD
£293 GBP
View
B+
Retailer 4
-
$448 USD
View
A
Retailer 5
-
$450 USD
View
A
Retailer 6
-
$587 USD
£462 GBP
View
A
Retailer 7
-
$594 USD
€566 EUR
View
B+
Retailer 8
-
$602 USD
View
B+
Retailer 9
-
$602 USD
View
B+
Retailer 10
-
$855 USD
View
Retailer 11
-
$1,080 USD
View
Price last confirmed 12 days ago
B
Retailer 12
-
$1,125 USD
View
B
Retailer 13
-
$1,346 USD
£1,060 GBP
View
Most Expensive
B
Brilliant Earth
11259540A · Nov 2
$1,590 USD
View
13 more retailers have this diamond
Prices start from $302 USDSave up to $1,288 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
$302 USD