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Heart|Natural|GIA

1.20ct K SI1 Heart Natural Diamond

EX • K/SI1 • GIA 6542470645

Certificate GIA 6542470645

Diamond specifications and retailer prices

From £1,352 GBP
As of November 5, 2026
6 retailers carry this diamond
Most expensive: £3,038 GBP at NZ Jewellers · As of September 25, 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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6542470645. Listed at 6 retailers as of November 5, 2026. 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
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Pavilion angle40.5°
OriginNatural
Grading LabGIA
CertificateGIA 6542470645
Dimensions6.46 × 7.29 × 4.29 mm
L/W Ratio1.13
Top View
6.46 mm7.29 mm1.20 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6542470645
Side View
Table 60.0%CrownGirdle: STK-VTKPavilion 40.5°Culet: NoneDepth 58.8%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 5
Current: £1,352 GBP|Low: £861 GBP|High: £2,185 GBP|Avg: £1,367 GBP|+1.2%
Retailer 1
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 5, 2026
Retailer 6£861 GBP
Retailer 4£1,039 GBP
Retailer 2£1,111 GBP
Retailer 7£1,148 GBP
Retailer 11£1,208 GBP
Retailer 9£1,270 GBP
Retailer 13£1,289 GBP
Retailer 3£1,307 GBP
Retailer 1£1,352 GBP
Retailer 10£1,480 GBP
Retailer 5£1,626 GBP
Retailer 12£1,810 GBP
Retailer 8£2,149 GBP

13 data points across 13 retailers

6 retailers

Retailer 1
-
£861 GBP
Price last confirmed 35 days ago
Retailer 2
-
£1,208 GBP
View
Price last confirmed 34 days ago
Retailer 3
-
£1,307 GBP
View
Price last confirmed 34 days ago
B+
Retailer 4
-
£1,352 GBP
View
Retailer 5
-
£2,149 GBP
View
Price last confirmed 36 days ago
Most Expensive
NZ Jewellers
80c6ff25-0563-45b2-9f7b-35fb56c6ce28 · Sep 25
£3,038 GBP
$4,066 USD
View
Price last confirmed 42 days ago
5 more retailers have this diamond
Prices start from £1,352 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
£1,352 GBP