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Oval|Lab Grown|IGI

1.21ct F FL Oval Lab Grown Diamond

ID • F/FL • IGI LG816615886

Shape and cutting style on the report: Oval brilliant

Certificate IGI LG816615886

Diamond specifications and retailer prices

From £171 GBP
As of November 3, 2026
Save £1,259 GBP (88%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £1,644 GBP at Rare Carat · As of October 11, 2026
View at Rare Carat

About this 1.21ct lab-grown oval diamond

This 1.21ct lab-grown oval sits in the classic one-carat band, graded F colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG816615886 or 816615886. Listed at 20 retailers as of November 3, 2026, with a 735% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
F
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.8°
Pavilion angle41.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816615886
Dimensions8.31 × 5.94 × 3.83 mm
L/W Ratio1.40
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
8.31 mm5.94 mm1.21 ctF / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816615886
Side View
Table 56.0%Crown 33.8°Girdle: Slightly ThickPavilion 41.3°Culet: NoneDepth 64.5%

Caratlytics Score

How it works →
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: Nov 3
Current: £1,637 GBP|Low: £171 GBP|High: £2,037 GBP|Avg: £620 GBP|-0.5%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
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Retailer 19
November 3, 2026
Retailer 2£171 GBP
Retailer 16£191 GBP
Retailer 14£199 GBP
Retailer 3£212 GBP
Retailer 8£216 GBP
Retailer 6£364 GBP
Retailer 9£365 GBP
Retailer 5£372 GBP
Retailer 19£399 GBP
Retailer 13£594 GBP
Retailer 12£681 GBP
Retailer 15£684 GBP
Retailer 11£706 GBP
Retailer 17£720 GBP
Retailer 10£761 GBP
Retailer 18£824 GBP
Retailer 4£864 GBP
Retailer 7£1,430 GBP
Rare Carat£1,637 GBP

31 data points across 19 retailers

20 retailers£171 GBP to £1,430 GBP

A
Cheapest Retailer
-
£171 GBP
A
Retailer 2
-
£191 GBP
View
Final sale: no returns
A
Retailer 3
-
£199 GBP
View
A
Retailer 4
-
£212 GBP
View
Retailer 5
-
£216 GBP
View
Price last confirmed 10 days ago
A
Retailer 6
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£364 GBP
View
A
Retailer 7
-
£365 GBP
View
A
Retailer 8
-
£372 GBP
View
A
Retailer 9
-
£399 GBP
View
B+
Retailer 10
-
£594 GBP
View
B+
Retailer 11
-
£681 GBP
View
B+
Retailer 12
-
£684 GBP
View
B+
Retailer 13
-
£706 GBP
View
B+
Retailer 14
-
£720 GBP
View
B+
Retailer 15
-
£761 GBP
View
B+
Retailer 16
-
£824 GBP
View
B+
Retailer 17
-
£864 GBP
View
B
Retailer 18
-
£1,430 GBP
View
Retailer 19
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£1,637 GBP
View
Price last confirmed 17 days ago
Most Expensive
Rare Carat
PD8866158JJ816 · Oct 11
£1,644 GBP
$2,220 USD
View
Price last confirmed 24 days ago
19 more retailers have this diamond
Prices start from £171 GBPSave up to £1,259 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
1.21ct Oval
£171 GBP