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Cushion|Lab Grown|IGI

1.64ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG526288476

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG526288476

Diamond specifications and retailer prices

From $225 USD
As of October 30, 2026
Save $1,255 USD (85%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $1,480 USD at Brilliant Earth · As of October 29, 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 LG526288476 or 526288476. Listed at 13 retailers as of October 29, 2026, with prices from $225 to $1,480, a $1,255 spread on the same certified stone. Brilliant Earth lists it at $1,480. 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 angle34.9°
Pavilion angle29.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG526288476
Dimensions7.64 × 6.14 × 4.03 mm
L/W Ratio1.24
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
7.64 mm6.14 mm1.64 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG526288476
Side View
Table 61.5%Crown 34.9°Girdle: MED-STKPavilion 29.2°Culet: NoneDepth 65.6%

Caratlytics Score

How it works →
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: $1,480 USD|Low: $225 USD|High: $1,570 USD|Avg: $680 USD|-5.7%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 9$225 USD
Retailer 5$338 USD
Retailer 3$412 USD
Retailer 2$458 USD
Retailer 10$505 USD
Retailer 8$586 USD
Retailer 7$639 USD
Retailer 6$1,045 USD
Retailer 4$1,173 USD
Brilliant Earth$1,480 USD

44 data points across 10 retailers

13 retailers$225 USD to $1,480 USD

A
Cheapest Retailer
-
$225 USD
Final sale: no returns
B+
Retailer 2
-
$338 USD
View
A
Retailer 3
-
$412 USD
€392 EUR
View
A
Retailer 4
-
$458 USD
£361 GBP
View
A
Retailer 5
-
$505 USD
View
A
Retailer 6
-
$566 USD
View
A
Retailer 7
-
$586 USD
View
B+
Retailer 8
-
$639 USD
View
B+
Retailer 9
-
$856 USD
View
Retailer 10
-
$1,045 USD
View
Price last confirmed 9 days ago
B
Retailer 11
-
$1,173 USD
£924 GBP
View
B
Retailer 12
-
$1,198 USD
View
Most Expensive
B
Brilliant Earth
10788641A · Oct 29
$1,480 USD
View
12 more retailers have this diamond
Prices start from $225 USDSave up to $1,255 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
$225 USD