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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 $198 USD
As of October 27, 2026
Save $1,042 USD (84%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $1,240 USD at Brilliant Earth · As of November 2, 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 16 retailers as of October 27, 2026, with prices from $198 to $1,240, a $1,042 spread on the same certified stone. Brilliant Earth lists it at $1,240. 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: $1,240 USD|Low: $198 USD|High: $1,365 USD|Avg: $624 USD|-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
November 2, 2026
Retailer 8$198 USD
Retailer 5$221 USD
Retailer 3$230 USD
Retailer 18$246 USD
Retailer 16$317 USD
Retailer 7$332 USD
Retailer 14$412 USD
Retailer 13$448 USD
Retailer 10$475 USD
Retailer 11$543 USD
Retailer 4$584 USD
Retailer 2$620 USD
Retailer 17$791 USD
Retailer 9$845 USD
Retailer 12$1,040 USD
Retailer 15$1,152 USD
Retailer 6$1,189 USD
Brilliant Earth$1,240 USD

41 data points across 18 retailers

16 retailers$198 USD to $1,240 USD

A
Cheapest Retailer
-
$198 USD
Retailer 2
-
$230 USD
View
Price last confirmed 9 days ago
Retailer 3
-
$246 USD
View
Price last confirmed 8 days ago
B+
Retailer 4
-
$332 USD
View
A
Retailer 5
-
$412 USD
€392 EUR
View
Retailer 6
-
$439 USD
£346 GBP
View
Price last confirmed 14 days ago
A
Retailer 7
-
$448 USD
£353 GBP
View
A
Retailer 8
-
$543 USD
View
Retailer 9
-
$584 USD
View
Price last confirmed 7 days ago
B+
Retailer 10
-
$620 USD
View
Retailer 11
-
$791 USD
View
Price last confirmed 8 days ago
B+
Retailer 12
-
$845 USD
View
B
Retailer 13
-
$1,040 USD
View
Retailer 14
-
$1,152 USD
£907 GBP
View
Price last confirmed 7 days ago
Retailer 15
-
$1,189 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
20682223A · Nov 2
$1,240 USD
View
15 more retailers have this diamond
Prices start from $198 USDSave up to $1,042 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
1.66ct Marquise
$198 USD