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Oval|Lab Grown|IGI

1.66ct E FL Oval Lab Grown Diamond

EX • E/FL • IGI LG818651106

Shape and cutting style on the report: Oval brilliant

Certificate IGI LG818651106

Diamond specifications and retailer prices

From £313 GBP
$419 USD
As of October 30, 2026
Save £2,702 GBP (90%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £3,015 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 1.66ct lab-grown oval diamond

This 1.66ct lab-grown oval sits in the one-and-a-half to two carat band, graded E colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG818651106 or 818651106. Listed at 20 retailers as of October 30, 2026, with prices from £313 to £3,015, a £2,702 spread on the same certified stone. Brilliant Earth lists it at £3,015. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.66
Carat
E
Colour
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.8°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818651106
Dimensions9.33 × 6.62 × 4.17 mm
L/W Ratio1.41
Girdle conditionFaceted
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
9.33 mm6.62 mm1.66 ctE / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818651106
Side View
Table 61.0%Crown 34.8°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 63.0%

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 30
Current: £3,015 GBP|Low: £313 GBP|High: £3,612 GBP|Avg: £1,009 GBP|-16.5%
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
October 31, 2026
Retailer 16£313 GBP
Retailer 2£346 GBP
Retailer 6£355 GBP
Retailer 11£459 GBP
Retailer 15£464 GBP
Retailer 8£610 GBP
Retailer 5£610 GBP
Retailer 10£625 GBP
Retailer 12£814 GBP
Retailer 13£917 GBP
Retailer 9£1,112 GBP
Retailer 4£1,141 GBP
Retailer 3£1,305 GBP
Retailer 14£1,306 GBP
Retailer 7£1,390 GBP
Brilliant Earth£3,015 GBP

36 data points across 16 retailers

20 retailers£313 GBP to £3,015 GBP

A
Cheapest Retailer
-
£313 GBP
$419 USD
Final sale: no returns
Retailer 2
-
£316 GBP
$424 USD
View
Price last confirmed 29 days ago
A
Retailer 3
-
£346 GBP
$464 USD
View
A
Retailer 4
-
£355 GBP
$476 USD
View
Retailer 5
-
£408 GBP
$547 USD
View
Price last confirmed 29 days ago
Retailer 6
-
£459 GBP
HK$4,800 HKD
View
Price last confirmed 57 days ago
A
Retailer 7
-
£459 GBP
$615 USD
View
A
Retailer 8
-
£464 GBP
$622 USD
View
A
Retailer 9
-
£610 GBP
ZAR 13,213 ZAR
View
A
Retailer 10
-
£625 GBP
View
A
Retailer 11
-
£814 GBP
$1,091 USD
View
B+
Retailer 12
-
£917 GBP
$1,229 USD
View
Retailer 13
-
£1,014 GBP
$1,358 USD
View
Price last confirmed 26 days ago
B+
Retailer 14
-
£1,112 GBP
$1,490 USD
View
B+
Retailer 15
-
£1,141 GBP
$1,529 USD
View
B+
Retailer 16
-
£1,305 GBP
$1,748 USD
View
B+
Retailer 17
-
£1,306 GBP
$1,750 USD
View
Retailer 18
-
£1,314 GBP
$1,760 USD
View
Price last confirmed 24 days ago
B+
Retailer 19
-
£1,390 GBP
View
Most Expensive
B
Brilliant Earth
21127849A · Oct 30
£3,015 GBP
$4,040 USD
View
19 more retailers have this diamond
Prices start from £313 GBPSave up to £2,702 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 Oval
£313 GBP