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Round|Natural|GIA

1.21ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 5563654767

Certificate GIA 5563654767

Diamond specifications and retailer prices

From £1,588 GBP
As of November 1, 2026
Save £1,977 GBP (55%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £4,457 GBP at NZ Jewellers · As of October 30, 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 5563654767. Listed at 18 retailers as of November 1, 2026, with a 125% 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
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 5563654767
Dimensions6.78 × 6.74 × 4.23 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Top View
6.78 mm6.74 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5563654767
Side View
Table 57.0%Crown 36°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.5%

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 1
Current: £4,457 GBP|Low: £1,522 GBP|High: £4,457 GBP|Avg: £2,240 GBP|+3.5%
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
Retailer 16
Retailer 17
Retailer 18
Retailer 19
November 2, 2026
Retailer 3£1,588 GBP
Retailer 12£1,616 GBP
Retailer 18£1,751 GBP
Retailer 8£1,793 GBP
Retailer 14£1,843 GBP
Retailer 17£1,967 GBP
Retailer 7£1,987 GBP
Retailer 6£1,995 GBP
Retailer 10£2,059 GBP
Retailer 16£2,132 GBP
Retailer 11£2,138 GBP
Retailer 9£2,207 GBP
Retailer 2£2,265 GBP
Retailer 4£2,297 GBP
Retailer 5£2,460 GBP
Retailer 13£2,491 GBP
Retailer 19£2,610 GBP
Retailer 15£3,565 GBP
NZ Jewellers£4,457 GBP

13 data points across 19 retailers

18 retailers£1,588 GBP to £3,565 GBP

A
Cheapest Retailer
-
£1,588 GBP
A
Retailer 2
-
£1,616 GBP
View
A
Retailer 3
-
£1,751 GBP
View
A
Retailer 4
-
£1,793 GBP
View
A
Retailer 5
-
£1,843 GBP
View
A
Retailer 6
-
£1,987 GBP
View
A
Retailer 7
-
£1,995 GBP
View
Retailer 8
-
£2,059 GBP
View
Price last confirmed 8 days ago
B+
Retailer 9
-
£2,132 GBP
View
Retailer 10
-
£2,138 GBP
View
Price last confirmed 8 days ago
B+
Retailer 11
-
£2,207 GBP
View
B+
Retailer 12
-
£2,265 GBP
View
B+
Retailer 13
-
£2,297 GBP
View
B+
Retailer 14
-
£2,460 GBP
View
B+
Retailer 15
-
£2,491 GBP
View
B+
Retailer 16
-
£2,610 GBP
View
B
Retailer 17
-
£3,565 GBP
View
Most Expensive
NZ Jewellers
70cd373a-5ba6-4d13-8090-58c9fbdf3b5b · Oct 30
£4,457 GBP
$5,999 USD
View
Price last confirmed 7 days ago
17 more retailers have this diamond
Prices start from £1,588 GBPSave up to £1,977 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
£1,588 GBP