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Round|Natural|GIA

1.21ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 6565200380

Certificate GIA 6565200380

Diamond specifications and retailer prices

From £1,415 GBP
As of November 6, 2026
Save £2,520 GBP (64%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £3,935 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6565200380. Listed at 21 retailers as of November 5, 2026, with prices from £1,415 to £3,935, a £2,520 spread on the same certified stone. NZ Jewellers lists it at £3,935. 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
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6565200380
Dimensions6.76 × 6.82 × 4.22 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal, Cloud, Needle
Top View
6.76 mm6.82 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6565200380
Side View
Table 58.0%Crown 35°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.2%

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 6
Current: £3,935 GBP|Low: £1,415 GBP|High: £3,935 GBP|Avg: £2,177 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 15£1,415 GBP
Retailer 2£1,473 GBP
Retailer 11£1,499 GBP
Retailer 14£1,711 GBP
Retailer 3£1,752 GBP
Retailer 8£1,776 GBP
Retailer 4£1,882 GBP
Retailer 6£1,882 GBP
Retailer 5£1,969 GBP
Retailer 9£1,980 GBP
Retailer 7£2,172 GBP
Retailer 10£2,297 GBP
Retailer 12£2,335 GBP
Retailer 13£3,288 GBP
NZ Jewellers£3,935 GBP

23 data points across 15 retailers

21 retailers£1,415 GBP to £3,935 GBP

A
Cheapest Retailer
-
£1,415 GBP
A
Retailer 2
-
£1,473 GBP
View
A
Retailer 3
-
£1,499 GBP
View
B+
Retailer 4
-
£1,711 GBP
View
B+
Retailer 5
-
£1,752 GBP
View
B+
Retailer 6
-
£1,752 GBP
View
B+
Retailer 7
-
£1,766 GBP
View
B+
Retailer 8
-
£1,776 GBP
View
Retailer 9
-
£1,882 GBP
View
Price last confirmed 8 days ago
B+
Retailer 10
-
£1,882 GBP
View
B+
Retailer 11
-
£1,935 GBP
View
B+
Retailer 12
-
£1,967 GBP
View
B+
Retailer 13
-
£1,969 GBP
View
B+
Retailer 14
-
£1,980 GBP
View
B+
Retailer 15
-
£1,987 GBP
View
Retailer 16
-
£2,108 GBP
View
Price last confirmed 30 days ago
B
Retailer 17
-
£2,172 GBP
View
B+
Retailer 18
-
£2,297 GBP
View
B+
Retailer 19
-
£2,335 GBP
View
B
Retailer 20
-
£3,288 GBP
View
Most Expensive
B
NZ Jewellers
3949d498-801d-49b3-ac99-dac1d4bfa867 · Nov 5
£3,935 GBP
$5,267 USD
View
20 more retailers have this diamond
Prices start from £1,415 GBPSave up to £2,520 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
£1,415 GBP