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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 €268 EUR
$299 USD
As of October 30, 2026
Save €1,066 EUR (80%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: €1,334 EUR at Brilliant Earth · As of October 31, 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 €268 to €1,334, a €1,066 spread on the same certified stone. Brilliant Earth lists it at €1,334. 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
Colour
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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: €1,334 EUR|Low: €190 EUR|High: €1,907 EUR|Avg: €696 EUR|-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
November 1, 2026
Retailer 13€268 EUR
Retailer 11€296 EUR
Retailer 12€396 EUR
Retailer 8€398 EUR
Retailer 6€526 EUR
Retailer 4€527 EUR
Retailer 3€535 EUR
Retailer 2€563 EUR
Retailer 10€748 EUR
Retailer 9€962 EUR
Retailer 5€997 EUR
Retailer 7€1,192 EUR
Brilliant Earth€1,334 EUR

43 data points across 13 retailers

13 retailers€268 EUR to €1,334 EUR

A
Cheapest Retailer
-
€268 EUR
$299 USD
Final sale: no returns
A
Retailer 2
-
€296 EUR
$331 USD
View
B+
Retailer 3
-
€396 EUR
$442 USD
View
A
Retailer 4
-
€398 EUR
$445 USD
View
A
Retailer 5
-
€526 EUR
View
A
Retailer 6
-
€527 EUR
$589 USD
View
A
Retailer 7
-
€535 EUR
$598 USD
View
A
Retailer 8
-
€563 EUR
£495 GBP
View
B+
Retailer 9
-
€748 EUR
$836 USD
View
Retailer 10
-
€962 EUR
$1,075 USD
View
Price last confirmed 10 days ago
B
Retailer 11
-
€997 EUR
$1,114 USD
View
B
Retailer 12
-
€1,192 EUR
£1,049 GBP
View
Most Expensive
B
Brilliant Earth
11226038A · Oct 31
€1,334 EUR
$1,490 USD
View
12 more retailers have this diamond
Prices start from €268 EURSave up to €1,066 EUR

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
€268 EUR