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Heart|Natural|GIA

1.20ct J SI1 Heart Natural Diamond

EX • J/SI1 • GIA 1549768433

Certificate GIA 1549768433

Diamond specifications and retailer prices

From £1,310 GBP
As of November 6, 2026
Save £1,718 GBP (57%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £3,633 GBP at NZ Jewellers · As of October 18, 2026
View at NZ Jewellers

About this 1.2ct natural heart diamond

This 1.2ct 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 1549768433. Listed at 18 retailers as of November 2, 2026, with a 131% 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

1.20
Carat
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1549768433
Dimensions6.68 × 7.17 × 4.43 mm
L/W Ratio1.07
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Twinning Wisp, Indented Natural, Natural
Top View
6.68 mm7.17 mm1.20 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1549768433
Side View
Table 62.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 61.7%

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: £3,633 GBP|Low: £1,310 GBP|High: £3,633 GBP|Avg: £2,029 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 13£1,310 GBP
Retailer 2£1,370 GBP
Retailer 11£1,546 GBP
Retailer 14£1,595 GBP
Retailer 5£1,738 GBP
Retailer 6£1,738 GBP
Retailer 3£1,818 GBP
Retailer 8£1,824 GBP
Retailer 9£1,878 GBP
Retailer 4£2,005 GBP
Retailer 10£2,110 GBP
Retailer 7£2,146 GBP
Retailer 12£3,028 GBP
NZ Jewellers£3,633 GBP

30 data points across 14 retailers

18 retailers£1,310 GBP to £3,028 GBP

A
Cheapest Retailer
-
£1,310 GBP
A
Retailer 2
-
£1,370 GBP
View
B+
Retailer 3
-
£1,546 GBP
View
B+
Retailer 4
-
£1,595 GBP
View
Final sale: no returns
B+
Retailer 5
-
£1,656 GBP
View
B+
Retailer 6
-
£1,659 GBP
View
Retailer 7
-
£1,738 GBP
View
Price last confirmed 20 days ago
Retailer 8
-
£1,738 GBP
View
Price last confirmed 22 days ago
B
Retailer 9
-
£1,776 GBP
View
Retailer 10
-
£1,818 GBP
View
Price last confirmed 22 days ago
B
Retailer 11
-
£1,824 GBP
View
B
Retailer 12
-
£1,878 GBP
View
Retailer 13
-
£2,005 GBP
View
Price last confirmed 19 days ago
B+
Retailer 14
-
£2,110 GBP
View
B
Retailer 15
-
£2,146 GBP
View
Retailer 16
-
£2,151 GBP
View
Price last confirmed 31 days ago
B
Retailer 17
-
£3,028 GBP
View
Most Expensive
NZ Jewellers
1d8c86bb-cf4d-4e68-8c48-ec0ff29708cf · Oct 18
£3,633 GBP
$4,863 USD
View
Price last confirmed 19 days ago
17 more retailers have this diamond
Prices start from £1,310 GBPSave up to £1,718 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
1.20ct Heart
£1,310 GBP