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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 $253 SGD
$198 USD
As of October 27, 2026
Save $1,333 SGD (84%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $1,586 SGD 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 17 retailers as of October 27, 2026, with prices from $253 to $1,586, a $1,333 spread on the same certified stone. Brilliant Earth lists it at $1,586. 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
Colour
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: $1,586 SGD|Low: $253 SGD|High: $1,745 SGD|Avg: $800 SGD|-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$253 SGD
Retailer 5$283 SGD
Retailer 3$294 SGD
Retailer 18$315 SGD
Retailer 16$405 SGD
Retailer 7$425 SGD
Retailer 14$526 SGD
Retailer 13$573 SGD
Retailer 10$607 SGD
Retailer 11$694 SGD
Retailer 4$747 SGD
Retailer 2$793 SGD
Retailer 17$1,012 SGD
Retailer 9$1,080 SGD
Retailer 12$1,330 SGD
Retailer 15$1,473 SGD
Retailer 6$1,520 SGD
Brilliant Earth$1,586 SGD

42 data points across 18 retailers

17 retailers$253 SGD to $1,586 SGD

A
Cheapest Retailer
-
$253 SGD
$198 USD
Retailer 2
-
$294 SGD
$230 USD
View
Price last confirmed 8 days ago
Retailer 3
-
$315 SGD
$246 USD
View
Price last confirmed 8 days ago
Retailer 4
-
$405 SGD
£249 GBP
View
Price last confirmed 16 days ago
B+
Retailer 5
-
$425 SGD
$332 USD
View
A
Retailer 6
-
$526 SGD
€392 EUR
View
Retailer 7
-
$562 SGD
£346 GBP
View
Price last confirmed 13 days ago
A
Retailer 8
-
$573 SGD
£353 GBP
View
A
Retailer 9
-
$694 SGD
$543 USD
View
Retailer 10
-
$747 SGD
$584 USD
View
Price last confirmed 7 days ago
B+
Retailer 11
-
$793 SGD
$620 USD
View
Retailer 12
-
$1,012 SGD
$791 USD
View
Price last confirmed 8 days ago
B+
Retailer 13
-
$1,080 SGD
$845 USD
View
B
Retailer 14
-
$1,330 SGD
$1,040 USD
View
B
Retailer 15
-
$1,473 SGD
£907 GBP
View
Retailer 16
-
$1,520 SGD
$1,189 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
20682223A · Nov 2
$1,586 SGD
$1,240 USD
View
16 more retailers have this diamond
Prices start from $253 SGDSave up to $1,333 SGD

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
$253 SGD