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Heart|Natural|GIA

1.21ct J SI1 Heart Natural Diamond

EX • J/SI1 • GIA 2245042739

Certificate GIA 2245042739

Diamond specifications and retailer prices

From £1,204 GBP
As of November 6, 2026
Save £2,223 GBP (65%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,427 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.21ct natural heart diamond

This 1.21ct natural heart sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2245042739. Listed at 12 retailers as of November 5, 2026, with prices from £1,204 to £3,427, a £2,223 spread on the same certified stone. NZ Jewellers lists it at £3,427. 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 (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
Pavilion angle38.94°
OriginNatural
Grading LabGIA
CertificateGIA 2245042739
Dimensions6.61 × 7.21 × 4.29 mm
L/W Ratio1.09
Key to symbols
Twinning Wisp, Feather, Crystal, Needle
Top View
6.61 mm7.21 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateGIA 2245042739
Side View
Table 62.0%CrownGirdle: THK-VTKPavilion 38.94°Culet: NoneDepth 59.5%

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 6
Current: £3,427 GBP|Low: £1,204 GBP|High: £3,662 GBP|Avg: £2,066 GBP|-6.4%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 10£1,204 GBP
Retailer 3£1,554 GBP
Retailer 2£1,590 GBP
Retailer 6£1,639 GBP
Retailer 5£1,675 GBP
Retailer 9£1,715 GBP
Retailer 7£1,802 GBP
Retailer 4£2,031 GBP
Retailer 11£2,502 GBP
Retailer 8£2,864 GBP
NZ Jewellers£3,427 GBP

38 data points across 11 retailers

12 retailers£1,204 GBP to £3,427 GBP

A
Cheapest Retailer
-
£1,204 GBP
B+
Retailer 2
-
£1,554 GBP
View
B+
Retailer 3
-
£1,590 GBP
View
B+
Retailer 4
-
£1,639 GBP
View
B+
Retailer 5
-
£1,675 GBP
View
B+
Retailer 6
-
£1,715 GBP
View
B+
Retailer 7
-
£1,802 GBP
View
B
Retailer 8
-
£1,844 GBP
View
B+
Retailer 9
-
£2,031 GBP
View
B
Retailer 10
-
£2,502 GBP
View
B
Retailer 11
-
£2,864 GBP
View
Most Expensive
B
NZ Jewellers
4f1787ab-5746-4b1c-9857-b23407ac4cfd · Nov 5
£3,427 GBP
$4,587 USD
View
11 more retailers have this diamond
Prices start from £1,204 GBPSave up to £2,223 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 Heart
£1,204 GBP