Round|Natural|GIA

1.21ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 2447434477

Certificate GIA 2447434477

Diamond specifications and retailer prices

From £1,473 GBP
As of November 6, 2026
Save £1,979 GBP (57%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £4,130 GBP at NZ Jewellers · As of October 17, 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 2447434477. Listed at 21 retailers as of November 4, 2026, with a 134% 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
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 2447434477
Dimensions6.80 × 6.76 × 4.25 mm
L/W Ratio1.01
Top View
6.80 mm6.76 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2447434477
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.7%

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: £2,300 GBP|Low: £1,423 GBP|High: £3,502 GBP|Avg: £2,157 GBP|+0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 2£1,473 GBP
Retailer 6£1,793 GBP
Retailer 7£1,823 GBP
Retailer 3£2,078 GBP
Retailer 8£2,213 GBP
Retailer 1£2,300 GBP
Retailer 4£2,411 GBP
Retailer 5£3,452 GBP

38 data points across 8 retailers

21 retailers£1,473 GBP to £3,452 GBP

A
Cheapest Retailer
-
£1,473 GBP
B+
Retailer 2
-
£1,733 GBP
View
B+
Retailer 3
-
£1,769 GBP
View
B+
Retailer 4
-
£1,793 GBP
View
B+
Retailer 5
-
£1,823 GBP
View
Final sale: no returns
B+
Retailer 6
-
£1,851 GBP
View
B+
Retailer 7
-
£1,950 GBP
View
Retailer 8
-
£1,975 GBP
View
Price last confirmed 44 days ago
Retailer 9
-
£1,975 GBP
View
Price last confirmed 19 days ago
Retailer 10
-
£1,975 GBP
View
Price last confirmed 21 days ago
Retailer 11
-
£2,052 GBP
View
Price last confirmed 22 days ago
B+
Retailer 12
-
£2,078 GBP
View
B+
Retailer 13
-
£2,081 GBP
View
Retailer 14
-
£2,213 GBP
View
Price last confirmed 30 days ago
Retailer 15
-
£2,279 GBP
View
Price last confirmed 19 days ago
Retailer 16
-
£2,279 GBP
View
Price last confirmed 45 days ago
B+
Retailer 17
-
£2,300 GBP
View
B+
Retailer 18
-
£2,411 GBP
View
B
Retailer 19
-
£3,452 GBP
View
Retailer 20
-
£4,130 GBP
View
Price last confirmed 46 days ago
Most Expensive
NZ Jewellers
d05e15f4-8009-4628-b689-e15d2496a80f · Oct 17
£4,130 GBP
$5,528 USD
View
Price last confirmed 20 days ago
20 more retailers have this diamond
Prices start from £1,473 GBPSave up to £1,979 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
£1,473 GBP