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Heart|Natural|GIA

1.20ct H SI1 Heart Natural Diamond

EX • H/SI1 • GIA 11239679

Certificate GIA 11239679

Diamond specifications and retailer prices

From £3,122 GBP
As of November 4, 2026
Save £1,698 GBP (35%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £6,608 GBP at NZ Jewellers · As of November 5, 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 11239679. Listed at 14 retailers as of November 4, 2026, with a 54% 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
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishGood
SymmetryGood
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 11239679
Dimensions6.62 × 7.63 × 4.38 mm
L/W Ratio1.15
Girdle conditionFaceted
Culet sizeVery Small
Top View
6.62 mm7.63 mm1.20 ctH / SI1
OriginNatural
CutExcellent
PolishGood
SymmetryGood
FluorescenceNone
CertificateGIA 11239679
Side View
Table 60.0%CrownGirdle: MED-THKPavilionCulet: Very SmallDepth 57.5%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £6,608 GBP|Low: £2,753 GBP|High: £6,608 GBP|Avg: £4,274 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
November 6, 2026
Retailer 8£3,304 GBP
Retailer 12£3,377 GBP
Retailer 10£3,579 GBP
Retailer 11£3,579 GBP
Retailer 13£3,579 GBP
Retailer 2£3,881 GBP
Retailer 9£3,983 GBP
Retailer 4£4,089 GBP
Retailer 3£4,130 GBP
Retailer 5£4,360 GBP
Retailer 6£4,820 GBP
Retailer 7£6,276 GBP
NZ Jewellers£6,608 GBP

45 data points across 13 retailers

14 retailers£3,122 GBP to £4,820 GBP

B
Cheapest Retailer
-
£3,122 GBP
B
Retailer 2
-
£3,304 GBP
View
Final sale: no returns
B
Retailer 3
-
£3,377 GBP
View
B
Retailer 4
-
£3,579 GBP
View
B
Retailer 5
-
£3,579 GBP
View
Retailer 6
-
£3,579 GBP
View
Price last confirmed 9 days ago
B
Retailer 7
-
£3,881 GBP
View
Retailer 8
-
£3,983 GBP
View
Price last confirmed 29 days ago
B
Retailer 9
-
£4,089 GBP
View
B
Retailer 10
-
£4,130 GBP
View
Retailer 11
-
£4,360 GBP
View
Price last confirmed 15 days ago
B
Retailer 12
-
£4,820 GBP
View
Retailer 13
-
£6,276 GBP
View
Price under review
Most Expensive
NZ Jewellers
c10bbc6e-0c46-450a-9884-6dd09bc51576 · Nov 5
£6,608 GBP
$8,845 USD
View
Price under review
13 more retailers have this diamond
Prices start from £3,122 GBPSave up to £1,698 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.

B
1.20ct Heart
£3,122 GBP