CaratHunter
Plans
Cushion|Lab Grown|IGI

1.64ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG526266176

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG526266176

Diamond specifications and retailer prices

From $299 USD
As of October 30, 2026
Save $1,191 USD (80%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $1,490 USD at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 1.64ct lab-grown cushion diamond

This 1.64ct 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 LG526266176 or 526266176. Listed at 13 retailers as of October 30, 2026, with prices from $299 to $1,490, a $1,191 spread on the same certified stone. Brilliant Earth lists it at $1,490. 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

1.64
Carat
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.7°
Pavilion angle39.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG526266176
Dimensions6.98 × 6.76 × 4.43 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
6.98 mm6.76 mm1.64 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG526266176
Side View
Table 65.5%Crown 35.7°Girdle: MED-VTKPavilion 39.3°Culet: NoneDepth 65.5%

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: Oct 30
Current: $1,490 USD|Low: $212 USD|High: $2,130 USD|Avg: $775 USD|-30.0%
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
October 30, 2026
Retailer 13$299 USD
Retailer 11$331 USD
Retailer 12$442 USD
Retailer 8$445 USD
Retailer 4$589 USD
Retailer 6$593 USD
Retailer 3$598 USD
Retailer 2$634 USD
Retailer 10$836 USD
Retailer 9$1,075 USD
Retailer 5$1,114 USD
Retailer 7$1,332 USD
Brilliant Earth$1,490 USD

43 data points across 13 retailers

13 retailers$299 USD to $1,490 USD

A
Cheapest Retailer
-
$299 USD
Final sale: no returns
A
Retailer 2
-
$331 USD
View
B+
Retailer 3
-
$442 USD
View
A
Retailer 4
-
$445 USD
View
A
Retailer 5
-
$589 USD
View
A
Retailer 6
-
$593 USD
€565 EUR
View
A
Retailer 7
-
$598 USD
View
B+
Retailer 8
-
$634 USD
£499 GBP
View
B+
Retailer 9
-
$836 USD
View
Retailer 10
-
$1,075 USD
View
Price last confirmed 9 days ago
B
Retailer 11
-
$1,114 USD
View
B
Retailer 12
-
$1,332 USD
£1,049 GBP
View
Most Expensive
B
Brilliant Earth
11226038A · Oct 30
$1,490 USD
View
12 more retailers have this diamond
Prices start from $299 USDSave up to $1,191 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
1.64ct Cushion
$299 USD