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1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • IGI 639424846

Shape and cutting style on the report: Round brilliant

Certificate IGI 639424846

Diamond specifications and retailer prices

From £2,099 GBP
As of November 4, 2026
Save £1,986 GBP (49%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £4,084 GBP at NZ Jewellers · As of November 5, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 639424846. Listed at 15 retailers as of November 4, 2026, with prices from £2,099 to £4,084, a £1,986 spread on the same certified stone. NZ Jewellers lists it at £4,084. 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.6°
Pavilion angle41.3°
OriginNatural
Grading LabIGI
CertificateIGI 639424846
Dimensions6.87 × 6.83 × 4.19 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.87 mm6.83 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 639424846
Side View
Table 60.0%Crown 34.6°Girdle: MediumPavilion 41.3°Culet: NoneDepth 61.1%

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: £2,189 GBP|Low: £2,099 GBP|High: £3,873 GBP|Avg: £2,595 GBP|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 7£2,099 GBP
Retailer 6£2,111 GBP
Retailer 8£2,164 GBP
Retailer 1£2,189 GBP
Retailer 9£2,434 GBP
Retailer 2£2,455 GBP
Retailer 3£2,568 GBP
Retailer 4£2,861 GBP
Retailer 5£3,815 GBP

39 data points across 9 retailers

15 retailers£2,099 GBP to £4,084 GBP

A
Cheapest Retailer
-
£2,099 GBP
A
Retailer 2
-
£2,099 GBP
View
A
Retailer 3
-
£2,111 GBP
View
B+
Retailer 4
-
£2,164 GBP
View
Final sale: no returns
A
Retailer 5
-
£2,189 GBP
View
Retailer 6
-
£2,344 GBP
View
Price last confirmed 8 days ago
B+
Retailer 7
-
£2,344 GBP
View
B+
Retailer 8
-
£2,434 GBP
View
B+
Retailer 9
-
£2,451 GBP
View
B+
Retailer 10
-
£2,455 GBP
View
B+
Retailer 11
-
£2,568 GBP
View
B
Retailer 12
-
£2,705 GBP
View
B
Retailer 13
-
£2,861 GBP
View
B
Retailer 14
-
£3,815 GBP
View
Most Expensive
B
NZ Jewellers
a8a486c7-4ee6-4846-b6b0-a328558e00b8 · Nov 5
£4,084 GBP
$5,467 USD
View
14 more retailers have this diamond
Prices start from £2,099 GBPSave up to £1,986 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
£2,099 GBP