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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 €269 EUR
$302 USD
As of November 1, 2026
Save €1,148 EUR (81%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: €1,418 EUR 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 €269 to €1,418, a €1,148 spread on the same certified stone. Brilliant Earth lists it at €1,418. 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

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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: €1,418 EUR|Low: €269 EUR|High: €1,427 EUR|Avg: €637 EUR|-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€269 EUR
Retailer 11€298 EUR
Retailer 6€332 EUR
Retailer 12€399 EUR
Retailer 9€401 EUR
Retailer 7€523 EUR
Retailer 5€530 EUR
Retailer 4€537 EUR
Retailer 2€762 EUR
Retailer 10€963 EUR
Retailer 8€1,200 EUR
Brilliant Earth€1,418 EUR

43 data points across 12 retailers

14 retailers€269 EUR to €1,418 EUR

A
Cheapest Retailer
-
€269 EUR
$302 USD
Final sale: no returns
Retailer 2
-
€298 EUR
$334 USD
View
Price last confirmed 8 days ago
A
Retailer 3
-
€332 EUR
£293 GBP
View
B+
Retailer 4
-
€399 EUR
$448 USD
View
A
Retailer 5
-
€401 EUR
$450 USD
View
A
Retailer 6
-
€523 EUR
£462 GBP
View
A
Retailer 7
-
€530 EUR
View
B+
Retailer 8
-
€537 EUR
$602 USD
View
B+
Retailer 9
-
€537 EUR
$602 USD
View
B+
Retailer 10
-
€762 EUR
$855 USD
View
Retailer 11
-
€963 EUR
$1,080 USD
View
Price last confirmed 12 days ago
B
Retailer 12
-
€1,003 EUR
$1,125 USD
View
B
Retailer 13
-
€1,200 EUR
£1,060 GBP
View
Most Expensive
B
Brilliant Earth
11259540A · Nov 2
€1,418 EUR
$1,590 USD
View
13 more retailers have this diamond
Prices start from €269 EURSave up to €1,148 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
1.66ct Cushion
€269 EUR