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 £148 GBP
$198 USD
As of October 27, 2026
Save £776 GBP (84%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £924 GBP 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 £148 to £924, a £776 spread on the same certified stone. Brilliant Earth lists it at £924. 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: £924 GBP|Low: £148 GBP|High: £1,017 GBP|Avg: £466 GBP|-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£148 GBP
Retailer 5£165 GBP
Retailer 3£171 GBP
Retailer 18£183 GBP
Retailer 16£236 GBP
Retailer 7£247 GBP
Retailer 14£307 GBP
Retailer 13£334 GBP
Retailer 10£354 GBP
Retailer 11£405 GBP
Retailer 4£435 GBP
Retailer 2£462 GBP
Retailer 17£589 GBP
Retailer 9£629 GBP
Retailer 12£775 GBP
Retailer 15£858 GBP
Retailer 6£886 GBP
Brilliant Earth£924 GBP

42 data points across 18 retailers

17 retailers£148 GBP to £924 GBP

A
Cheapest Retailer
-
£148 GBP
$198 USD
Retailer 2
-
£171 GBP
$230 USD
View
Price last confirmed 8 days ago
Retailer 3
-
£183 GBP
$246 USD
View
Price last confirmed 8 days ago
Retailer 4
-
£236 GBP
View
Price last confirmed 16 days ago
B+
Retailer 5
-
£247 GBP
$332 USD
View
A
Retailer 6
-
£307 GBP
€392 EUR
View
Retailer 7
-
£327 GBP
View
Price last confirmed 13 days ago
A
Retailer 8
-
£334 GBP
View
A
Retailer 9
-
£405 GBP
$543 USD
View
Retailer 10
-
£435 GBP
$584 USD
View
Price last confirmed 7 days ago
B+
Retailer 11
-
£462 GBP
$620 USD
View
Retailer 12
-
£589 GBP
$791 USD
View
Price last confirmed 8 days ago
B+
Retailer 13
-
£629 GBP
$845 USD
View
B
Retailer 14
-
£775 GBP
$1,040 USD
View
B
Retailer 15
-
£858 GBP
View
Retailer 16
-
£886 GBP
$1,189 USD
View
Price last confirmed 8 days ago
Most Expensive
B
Brilliant Earth
20682223A · Nov 2
£924 GBP
$1,240 USD
View
16 more retailers have this diamond
Prices start from £148 GBPSave up to £776 GBP

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
£148 GBP