CaratHunter
Plans
Round|Natural|GIA

1.21ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 2231667421

Certificate GIA 2231667421

Diamond specifications and retailer prices

From £1,674 GBP
As of November 5, 2026
Save £2,979 GBP (64%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £4,653 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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2231667421. Listed at 15 retailers as of November 5, 2026, with prices from £1,674 to £4,653, a £2,979 spread on the same certified stone. NZ Jewellers lists it at £4,653. 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
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2231667421
Dimensions6.83 × 6.86 × 4.25 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Needle
Top View
6.83 mm6.86 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2231667421
Side View
Table 55.0%Crown 35.5°Girdle: THN-MEDPavilion 40.8°Culet: NoneDepth 62.1%

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 5
Current: £4,653 GBP|Low: £1,674 GBP|High: £4,653 GBP|Avg: £2,488 GBP
NZ Jewellers
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
November 6, 2026
Retailer 6£1,674 GBP
Retailer 7£1,955 GBP
Retailer 11£1,988 GBP
Retailer 4£2,205 GBP
Retailer 10£2,209 GBP
Retailer 12£2,209 GBP
Retailer 13£2,226 GBP
Retailer 5£2,326 GBP
Retailer 14£2,326 GBP
Retailer 2£2,365 GBP
Retailer 3£2,400 GBP
Retailer 8£2,450 GBP
Retailer 15£3,239 GBP
Retailer 9£3,712 GBP
NZ Jewellers£4,653 GBP

25 data points across 15 retailers

15 retailers£1,674 GBP to £4,653 GBP

A
Cheapest Retailer
-
£1,674 GBP
A
Retailer 2
-
£1,955 GBP
View
A
Retailer 3
-
£1,988 GBP
View
B+
Retailer 4
-
£2,205 GBP
View
B+
Retailer 5
-
£2,209 GBP
View
B+
Retailer 6
-
£2,209 GBP
View
B+
Retailer 7
-
£2,226 GBP
View
B+
Retailer 8
-
£2,326 GBP
View
B+
Retailer 9
-
£2,326 GBP
View
B+
Retailer 10
-
£2,365 GBP
View
B+
Retailer 11
-
£2,400 GBP
View
B+
Retailer 12
-
£2,450 GBP
View
B
Retailer 13
-
£3,239 GBP
View
B
Retailer 14
-
£3,712 GBP
View
Most Expensive
B
NZ Jewellers
c8614bb8-53af-487f-bd0f-6c8b45bb686f · Nov 5
£4,653 GBP
$6,262 USD
View
14 more retailers have this diamond
Prices start from £1,674 GBPSave up to £2,979 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
£1,674 GBP