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Marquise|Lab Grown|IGI

1.66ct E SI1 Marquise Lab Grown Diamond

ID • E/SI1 • IGI LG807673684

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG807673684

Diamond specifications and retailer prices

From $277 CAD
$198 USD
As of October 27, 2026
Save $1,456 CAD (84%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $1,732 CAD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.66ct lab-grown marquise diamond

This 1.66ct lab-grown marquise sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG807673684 or 807673684. Listed at 18 retailers as of October 27, 2026, with prices from $277 to $1,732, a $1,456 spread on the same certified stone. Brilliant Earth lists it at $1,732. 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
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.8°
Pavilion angle39.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG807673684
Dimensions12.86 × 6.07 × 3.68 mm
L/W Ratio2.12
Girdle conditionFaceted
Culet sizeNone
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
12.86 mm6.07 mm1.66 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG807673684
Side View
Table 63.0%Crown 35.8°Girdle: MED-THKPavilion 39.1°Culet: NoneDepth 60.6%

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: Oct 27
Current: $1,732 CAD|Low: $277 CAD|High: $1,906 CAD|Avg: $874 CAD|-2.4%
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
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
October 30, 2026
Retailer 8$277 CAD
Retailer 5$309 CAD
Retailer 3$321 CAD
Retailer 18$344 CAD
Retailer 15$442 CAD
Retailer 7$464 CAD
Retailer 13$575 CAD
Retailer 12$625 CAD
Retailer 10$664 CAD
Retailer 2$759 CAD
Retailer 4$816 CAD
Retailer 17$855 CAD
Retailer 16$1,105 CAD
Retailer 9$1,180 CAD
Retailer 11$1,453 CAD
Retailer 14$1,609 CAD
Retailer 6$1,660 CAD
Brilliant Earth$1,732 CAD

41 data points across 18 retailers

18 retailers$277 CAD to $1,732 CAD

A
Cheapest Retailer
-
$277 CAD
$198 USD
A
Retailer 2
-
$309 CAD
$221 USD
View
Final sale: no returns
Retailer 3
-
$321 CAD
$230 USD
View
Price last confirmed 8 days ago
A
Retailer 4
-
$344 CAD
$246 USD
View
Retailer 5
-
$442 CAD
£249 GBP
View
Price last confirmed 16 days ago
B+
Retailer 6
-
$464 CAD
$332 USD
View
A
Retailer 7
-
$575 CAD
€392 EUR
View
Retailer 8
-
$613 CAD
£346 GBP
View
Price last confirmed 13 days ago
A
Retailer 9
-
$625 CAD
£353 GBP
View
A
Retailer 10
-
$759 CAD
$543 USD
View
B+
Retailer 11
-
$816 CAD
$584 USD
View
A
Retailer 12
-
$855 CAD
$612 USD
View
B+
Retailer 13
-
$1,105 CAD
$791 USD
View
B+
Retailer 14
-
$1,180 CAD
$845 USD
View
B
Retailer 15
-
$1,453 CAD
$1,040 USD
View
B
Retailer 16
-
$1,609 CAD
£907 GBP
View
B
Retailer 17
-
$1,660 CAD
$1,189 USD
View
Most Expensive
B
Brilliant Earth
20682223A · Oct 31
$1,732 CAD
$1,240 USD
View
17 more retailers have this diamond
Prices start from $277 CADSave up to $1,456 CAD

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 Marquise
$277 CAD