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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 HK$1,554 HKD
$198 USD
As of October 27, 2026
Save HK$8,176 HKD (84%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: HK$9,729 HKD 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 HK$1,554 to HK$9,729, a HK$8,176 spread on the same certified stone. Brilliant Earth lists it at HK$9,729. 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

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 27
Current: HK$9,729 HKD|Low: HK$1,554 HKD|High: HK$10,706 HKD|Avg: HK$4,906 HKD|-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 8HK$1,554 HKD
Retailer 5HK$1,734 HKD
Retailer 3HK$1,805 HKD
Retailer 18HK$1,930 HKD
Retailer 16HK$2,484 HKD
Retailer 7HK$2,605 HKD
Retailer 14HK$3,229 HKD
Retailer 13HK$3,513 HKD
Retailer 10HK$3,727 HKD
Retailer 11HK$4,260 HKD
Retailer 4HK$4,582 HKD
Retailer 2HK$4,865 HKD
Retailer 17HK$6,206 HKD
Retailer 9HK$6,627 HKD
Retailer 12HK$8,160 HKD
Retailer 15HK$9,038 HKD
Retailer 6HK$9,326 HKD
Brilliant EarthHK$9,729 HKD

42 data points across 18 retailers

17 retailersHK$1,554 HKD to HK$9,729 HKD

A
Cheapest Retailer
-
HK$1,554 HKD
$198 USD
Retailer 2
-
HK$1,805 HKD
$230 USD
View
Price last confirmed 8 days ago
Retailer 3
-
HK$1,930 HKD
$246 USD
View
Price last confirmed 8 days ago
Retailer 4
-
HK$2,484 HKD
£249 GBP
View
Price last confirmed 16 days ago
B+
Retailer 5
-
HK$2,605 HKD
$332 USD
View
A
Retailer 6
-
HK$3,229 HKD
€392 EUR
View
Retailer 7
-
HK$3,445 HKD
£346 GBP
View
Price last confirmed 13 days ago
A
Retailer 8
-
HK$3,513 HKD
£353 GBP
View
A
Retailer 9
-
HK$4,260 HKD
$543 USD
View
Retailer 10
-
HK$4,582 HKD
$584 USD
View
Price last confirmed 7 days ago
B+
Retailer 11
-
HK$4,865 HKD
$620 USD
View
Retailer 12
-
HK$6,206 HKD
$791 USD
View
Price last confirmed 8 days ago
B+
Retailer 13
-
HK$6,627 HKD
$845 USD
View
B
Retailer 14
-
HK$8,160 HKD
$1,040 USD
View
B
Retailer 15
-
HK$9,038 HKD
£907 GBP
View
Retailer 16
-
HK$9,326 HKD
$1,189 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
20682223A · Nov 2
HK$9,729 HKD
$1,240 USD
View
16 more retailers have this diamond
Prices start from HK$1,554 HKDSave up to HK$8,176 HKD

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
HK$1,554 HKD