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Round|Natural|IGI

1.21ct K IF Round Natural Diamond

EX • K/IF • IGI 813663903

Shape and cutting style on the report: Round brilliant

Certificate IGI 813663903

Diamond specifications and retailer prices

From £1,278 GBP
As of November 1, 2026
Save £581 GBP (31%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £3,588 GBP at NZ Jewellers · As of September 24, 2026
View at NZ Jewellers

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded K colour (faint-tinted) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI 813663903. Listed at 14 retailers as of November 1, 2026, with a 45% 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
K
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35.5°
Pavilion angle40.9°
OriginNatural
Grading LabIGI
CertificateIGI 813663903
Dimensions6.80 × 6.83 × 4.22 mm
L/W Ratio1.00
Girdle conditionFaceted
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.80 mm6.83 mm1.21 ctK / IF
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateIGI 813663903
Side View
Table 57.0%Crown 35.5°Girdle: THN-MEDPavilion 40.9°Culet: NoneDepth 61.9%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: £1,715 GBP|Low: £1,278 GBP|High: £2,608 GBP|Avg: £1,744 GBP
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 4, 2026
Retailer 6£1,304 GBP
Retailer 4£1,326 GBP
Retailer 9£1,480 GBP
Retailer 5£1,670 GBP
Retailer 1£1,715 GBP
Retailer 2£1,838 GBP
Retailer 3£1,859 GBP
Retailer 7£2,096 GBP
Retailer 8£2,590 GBP

37 data points across 9 retailers

14 retailers£1,278 GBP to £1,859 GBP

A
Cheapest Retailer
-
£1,278 GBP
A
Retailer 2
-
£1,304 GBP
View
A
Retailer 3
-
£1,326 GBP
View
Retailer 4
-
£1,471 GBP
View
Price last confirmed 44 days ago
Retailer 5
-
£1,471 GBP
View
Price last confirmed 36 days ago
A
Retailer 6
-
£1,480 GBP
View
A
Retailer 7
-
£1,670 GBP
View
A
Retailer 8
-
£1,700 GBP
View
A
Retailer 9
-
£1,715 GBP
View
A
Retailer 10
-
£1,838 GBP
View
A
Retailer 11
-
£1,859 GBP
View
Retailer 12
-
£2,096 GBP
View
Price last confirmed 11 days ago
Retailer 13
-
£2,590 GBP
View
Price last confirmed 16 days ago
Most Expensive
NZ Jewellers
d551b695-9eec-495c-9d0f-dda8f08e3623 · Sep 24
£3,588 GBP
$4,802 USD
View
Price last confirmed 43 days ago
13 more retailers have this diamond
Prices start from £1,278 GBPSave up to £581 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 Round
£1,278 GBP