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Cushion|Lab Grown|IGI

8.57ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG659456905

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG659456905

Diamond specifications and retailer prices

From €1,189 EUR
$1,334 USD
As of November 1, 2026
Save €4,766 EUR (80%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: €5,956 EUR at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 8.57ct lab-grown cushion diamond

This 8.57ct lab-grown cushion sits in the over five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG659456905 or 659456905. Listed at 13 retailers as of November 1, 2026, with prices from €1,189 to €5,956, a €4,766 spread on the same certified stone. Brilliant Earth lists it at €5,956. 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

8.57
Carat
F
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.5°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG659456905
Dimensions14.09 × 11.06 × 7.32 mm
L/W Ratio1.27
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
14.09 mm11.06 mm8.57 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG659456905
Side View
Table 66.0%Crown 32.5°Girdle: STK-VTKPavilion 40.5°Culet: NoneDepth 66.2%

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: €5,956 EUR|Low: €1,189 EUR|High: €6,143 EUR|Avg: €2,884 EUR|-3.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 2, 2026
Retailer 4€1,189 EUR
Retailer 10€1,233 EUR
Retailer 8€1,386 EUR
Retailer 9€1,764 EUR
Retailer 5€1,789 EUR
Retailer 7€2,169 EUR
Retailer 2€2,246 EUR
Retailer 6€3,961 EUR
Retailer 3€4,128 EUR
Retailer 11€4,536 EUR
Retailer 12€4,993 EUR
Brilliant Earth€5,956 EUR

41 data points across 12 retailers

13 retailers€1,189 EUR to €5,956 EUR

A
Cheapest Retailer
-
€1,189 EUR
$1,334 USD
Final sale: no returns
Retailer 2
-
€1,233 EUR
$1,383 USD
View
Price last confirmed 21 days ago
A
Retailer 3
-
€1,386 EUR
$1,555 USD
View
B+
Retailer 4
-
€1,764 EUR
$1,978 USD
View
A
Retailer 5
-
€1,789 EUR
£1,580 GBP
View
B+
Retailer 6
-
€2,169 EUR
View
B+
Retailer 7
-
€2,246 EUR
$2,519 USD
View
B
Retailer 8
-
€3,961 EUR
£3,498 GBP
View
B
Retailer 9
-
€4,128 EUR
SGD 6,256 SGD
View
B
Retailer 10
-
€4,320 EUR
$4,845 USD
View
B
Retailer 11
-
€4,536 EUR
$5,088 USD
View
Retailer 12
-
€4,993 EUR
$5,600 USD
View
Price last confirmed 26 days ago
Most Expensive
B
Brilliant Earth
14242575A · Nov 2
€5,956 EUR
$6,680 USD
View
12 more retailers have this diamond
Prices start from €1,189 EURSave up to €4,766 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
8.57ct Cushion
€1,189 EUR