Heart|Natural|GIA

1.20ct H SI1 Heart Natural Diamond

ID • H/SI1 • GIA 3545938134

Certificate GIA 3545938134

Diamond specifications and retailer prices

From £1,587 GBP
As of November 6, 2026
Save £2,051 GBP (56%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £4,377 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 H 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 3545938134. Listed at 22 retailers as of November 4, 2026, with a 129% 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
H
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 3545938134
Dimensions6.60 × 7.51 × 4.44 mm
L/W Ratio1.14
Top View
6.60 mm7.51 mm1.20 ctH / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 3545938134
Side View
Table 63.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 59.1%

Caratlytics Score

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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: £4,377 GBP|Low: £1,587 GBP|High: £4,377 GBP|Avg: £2,572 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
Retailer 15
Retailer 16
November 6, 2026
Retailer 3£1,587 GBP
Retailer 2£1,652 GBP
Retailer 13£1,866 GBP
Retailer 5£1,922 GBP
Retailer 14£1,961 GBP
Retailer 9£2,019 GBP
Retailer 8£2,093 GBP
Retailer 4£2,188 GBP
Retailer 10£2,201 GBP
Retailer 11£2,203 GBP
Retailer 16£2,264 GBP
Retailer 7£2,416 GBP
Retailer 12£2,541 GBP
Retailer 15£3,638 GBP
Retailer 6£4,307 GBP
NZ Jewellers£4,377 GBP

24 data points across 16 retailers

22 retailers£1,587 GBP to £3,638 GBP

A
Cheapest Retailer
-
£1,587 GBP
A
Retailer 2
-
£1,652 GBP
View
B+
Retailer 3
-
£1,866 GBP
View
B+
Retailer 4
-
£1,922 GBP
View
Final sale: no returns
B+
Retailer 5
-
£1,961 GBP
View
B+
Retailer 6
-
£1,982 GBP
View
B+
Retailer 7
-
£1,984 GBP
View
B+
Retailer 8
-
£2,019 GBP
View
Retailer 9
-
£2,093 GBP
View
Price last confirmed 20 days ago
Retailer 10
-
£2,115 GBP
View
Price last confirmed 22 days ago
B+
Retailer 11
-
£2,188 GBP
View
Retailer 12
-
£2,197 GBP
View
Price last confirmed 22 days ago
B+
Retailer 13
-
£2,201 GBP
View
B+
Retailer 14
-
£2,203 GBP
View
B+
Retailer 15
-
£2,247 GBP
View
B+
Retailer 16
-
£2,264 GBP
View
Retailer 17
-
£2,383 GBP
View
Price last confirmed 31 days ago
Retailer 18
-
£2,416 GBP
View
Price last confirmed 19 days ago
B+
Retailer 19
-
£2,541 GBP
View
B
Retailer 20
-
£3,638 GBP
View
Retailer 21
-
£4,307 GBP
View
Price last confirmed 10 days ago
Most Expensive
NZ Jewellers
dd034e2e-e7de-4487-a812-4eff1fbf8c7e · Oct 18
£4,377 GBP
$5,859 USD
View
Price last confirmed 20 days ago
21 more retailers have this diamond
Prices start from £1,587 GBPSave up to £2,051 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
£1,587 GBP