CaratHunter
Plans
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 $283 AUD
$198 USD
As of October 27, 2026
Save $1,487 AUD (84%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $1,769 AUD 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 $283 to $1,769, a $1,487 spread on the same certified stone. Brilliant Earth lists it at $1,769. 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: $1,769 AUD|Low: $283 AUD|High: $1,947 AUD|Avg: $892 AUD|-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$283 AUD
Retailer 5$315 AUD
Retailer 3$328 AUD
Retailer 18$351 AUD
Retailer 16$452 AUD
Retailer 7$474 AUD
Retailer 14$587 AUD
Retailer 13$639 AUD
Retailer 10$678 AUD
Retailer 11$775 AUD
Retailer 4$833 AUD
Retailer 2$885 AUD
Retailer 17$1,129 AUD
Retailer 9$1,205 AUD
Retailer 12$1,484 AUD
Retailer 15$1,644 AUD
Retailer 6$1,696 AUD
Brilliant Earth$1,769 AUD

42 data points across 18 retailers

17 retailers$283 AUD to $1,769 AUD

A
Cheapest Retailer
-
$283 AUD
$198 USD
Retailer 2
-
$328 AUD
$230 USD
View
Price last confirmed 8 days ago
Retailer 3
-
$351 AUD
$246 USD
View
Price last confirmed 8 days ago
Retailer 4
-
$452 AUD
£249 GBP
View
Price last confirmed 16 days ago
B+
Retailer 5
-
$474 AUD
$332 USD
View
A
Retailer 6
-
$587 AUD
€392 EUR
View
Retailer 7
-
$627 AUD
£346 GBP
View
Price last confirmed 13 days ago
A
Retailer 8
-
$639 AUD
£353 GBP
View
A
Retailer 9
-
$775 AUD
$543 USD
View
Retailer 10
-
$833 AUD
$584 USD
View
Price last confirmed 7 days ago
B+
Retailer 11
-
$885 AUD
$620 USD
View
Retailer 12
-
$1,129 AUD
$791 USD
View
Price last confirmed 8 days ago
B+
Retailer 13
-
$1,205 AUD
$845 USD
View
B
Retailer 14
-
$1,484 AUD
$1,040 USD
View
B
Retailer 15
-
$1,644 AUD
£907 GBP
View
Retailer 16
-
$1,696 AUD
$1,189 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
20682223A · Nov 2
$1,769 AUD
$1,240 USD
View
16 more retailers have this diamond
Prices start from $283 AUDSave up to $1,487 AUD

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
$283 AUD