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Heart|Natural|GIA

1.00ct J SI2 Heart Natural Diamond

EX • J/SI2 • GIA 6421196620

Certificate GIA 6421196620

Diamond specifications and retailer prices

From £851 GBP
As of November 6, 2026
Save £2,075 GBP (71%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £2,926 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1ct natural heart diamond

This 1ct natural heart sits in the classic one-carat band, graded J colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6421196620. Listed at 16 retailers as of November 5, 2026, with prices from £851 to £2,926, a £2,075 spread on the same certified stone. NZ Jewellers lists it at £2,926. 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

1.00
Carat
J
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 6421196620
Dimensions6.38 × 6.73 × 3.62 mm
L/W Ratio1.05
Top View
6.38 mm6.73 mm1.00 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 6421196620
Side View
Table 62.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 53.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £851 GBP|Low: £817 GBP|High: £2,126 GBP|Avg: £1,300 GBP|-3.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 1£851 GBP
Retailer 5£870 GBP
Retailer 6£1,106 GBP
Retailer 7£1,254 GBP
Retailer 3£1,330 GBP
Retailer 2£1,629 GBP
Retailer 4£2,096 GBP

43 data points across 7 retailers

16 retailers£851 GBP to £2,926 GBP

A
Cheapest Retailer
-
£851 GBP
A
Retailer 2
-
£870 GBP
View
B+
Retailer 3
-
£1,106 GBP
View
Final sale: no returns
B+
Retailer 4
-
£1,152 GBP
View
Retailer 5
-
£1,199 GBP
View
Price last confirmed 8 days ago
B+
Retailer 6
-
£1,199 GBP
View
B+
Retailer 7
-
£1,208 GBP
View
B+
Retailer 8
-
£1,208 GBP
View
B+
Retailer 9
-
£1,254 GBP
View
B+
Retailer 10
-
£1,314 GBP
View
B+
Retailer 11
-
£1,330 GBP
View
B
Retailer 12
-
£1,384 GBP
View
B
Retailer 13
-
£1,629 GBP
View
B
Retailer 14
-
£2,096 GBP
View
B
Retailer 15
-
£2,521 GBP
View
Most Expensive
C
NZ Jewellers
228d1c5b-7ff2-4645-a657-2199bf30e83c · Nov 5
£2,926 GBP
$3,916 USD
View
15 more retailers have this diamond
Prices start from £851 GBPSave up to £2,075 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
1.00ct Heart
£851 GBP