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Round|Natural|IGI

1.21ct K SI2 Round Natural Diamond

EX • K/SI2 • IGI 803629479

Shape and cutting style on the report: Round brilliant

Certificate IGI 803629479

Diamond specifications and retailer prices

From £1,030 GBP
As of November 4, 2026
Save £912 GBP (47%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £2,712 GBP at NZ Jewellers · As of September 19, 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI 803629479. Listed at 10 retailers as of November 4, 2026, with a 89% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.21
Carat
K
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.6°
OriginNatural
Grading LabIGI
CertificateIGI 803629479
Dimensions6.76 × 6.78 × 4.28 mm
L/W Ratio1.00
Girdle conditionFaceted
Top View
6.76 mm6.78 mm1.21 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 803629479
Side View
Table 58.0%Crown 35°Girdle: MED-STKPavilion 41.6°CuletDepth 63.3%

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: Nov 4
Current: £1,538 GBP|Low: £1,030 GBP|High: £1,969 GBP|Avg: £1,315 GBP|+2.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 5, 2026
Retailer 4£1,030 GBP
Retailer 3£1,082 GBP
Retailer 6£1,112 GBP
Retailer 5£1,157 GBP
Retailer 7£1,213 GBP
Retailer 8£1,323 GBP
Retailer 1£1,538 GBP
Retailer 2£1,942 GBP

24 data points across 8 retailers

10 retailers£1,030 GBP to £1,942 GBP

A
Cheapest Retailer
-
£1,030 GBP
A
Retailer 2
-
£1,082 GBP
View
Retailer 3
-
£1,112 GBP
View
Price last confirmed 50 days ago
B+
Retailer 4
-
£1,157 GBP
View
B+
Retailer 5
-
£1,213 GBP
View
Retailer 6
-
£1,283 GBP
View
Price last confirmed 60 days ago
Retailer 7
-
£1,283 GBP
View
Price last confirmed 48 days ago
B+
Retailer 8
-
£1,538 GBP
View
B
Retailer 9
-
£1,942 GBP
View
Most Expensive
NZ Jewellers
0fb3d9da-15a2-455c-ad7a-e67fd1ab4732 · Sep 19
£2,712 GBP
$3,630 USD
View
Price last confirmed 47 days ago
9 more retailers have this diamond
Prices start from £1,030 GBPSave up to £912 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
£1,030 GBP