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Round|Natural|GIA

1.21ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 6552175864

Certificate GIA 6552175864

Diamond specifications and retailer prices

From £1,340 GBP
As of November 6, 2026
Save £2,419 GBP (64%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £3,759 GBP at NZ Jewellers · As of November 2, 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 6552175864. Listed at 18 retailers as of November 2, 2026, with prices from £1,340 to £3,759, a £2,419 spread on the same certified stone. NZ Jewellers lists it at £3,759. 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
FluorescenceStrong
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 6552175864
Dimensions6.79 × 6.83 × 4.25 mm
L/W Ratio1.01
Girdle conditionSlightly Thick
Top View
6.79 mm6.83 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 6552175864
Side View
Table 57.0%Crown 35.5°Girdle: MediumPavilion 41.2°Culet: NoneDepth 62.3%

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 6
Current: £3,759 GBP|Low: £1,340 GBP|High: £3,759 GBP|Avg: £2,028 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
November 6, 2026
Retailer 7£1,340 GBP
Retailer 13£1,632 GBP
Retailer 12£1,636 GBP
Retailer 6£1,659 GBP
Retailer 11£1,702 GBP
Retailer 3£1,798 GBP
Retailer 4£1,798 GBP
Retailer 2£1,880 GBP
Retailer 9£1,890 GBP
Retailer 5£2,074 GBP
Retailer 8£2,094 GBP
Retailer 14£2,209 GBP
Retailer 10£3,141 GBP
NZ Jewellers£3,759 GBP

28 data points across 14 retailers

18 retailers£1,340 GBP to £3,759 GBP

A
Cheapest Retailer
-
£1,340 GBP
B+
Retailer 2
-
£1,624 GBP
View
B+
Retailer 3
-
£1,632 GBP
View
B+
Retailer 4
-
£1,636 GBP
View
B+
Retailer 5
-
£1,659 GBP
View
Final sale: no returns
B+
Retailer 6
-
£1,695 GBP
View
B+
Retailer 7
-
£1,702 GBP
View
B+
Retailer 8
-
£1,789 GBP
View
B+
Retailer 9
-
£1,798 GBP
View
Retailer 10
-
£1,798 GBP
View
Price last confirmed 8 days ago
B+
Retailer 11
-
£1,880 GBP
View
B+
Retailer 12
-
£1,890 GBP
View
B
Retailer 13
-
£2,074 GBP
View
B+
Retailer 14
-
£2,094 GBP
View
B
Retailer 15
-
£2,209 GBP
View
Retailer 16
-
£2,213 GBP
View
Price last confirmed 30 days ago
B
Retailer 17
-
£3,141 GBP
View
Most Expensive
B
NZ Jewellers
d4b92014-6fab-4719-bdf5-d39cdee6a9a9 · Nov 2
£3,759 GBP
$5,031 USD
View
17 more retailers have this diamond
Prices start from £1,340 GBPSave up to £2,419 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
£1,340 GBP