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Heart|Natural|GIA

1.00ct K SI1 Heart Natural Diamond

EX • K/SI1 • GIA 1558862150

Certificate GIA 1558862150

Diamond specifications and retailer prices

From £902 GBP
As of November 6, 2026
Save £944 GBP (51%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £2,697 GBP at NZ Jewellers · As of September 20, 2026
View at NZ Jewellers

About this 1ct natural heart diamond

This 1ct 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 1558862150. Listed at 10 retailers as of November 4, 2026, with a 105% 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

1.00
Carat
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 1558862150
Dimensions5.97 × 6.91 × 4.08 mm
L/W Ratio1.16
Culet sizeNone
Key to symbols
Feather, Cloud
Top View
5.97 mm6.91 mm1.00 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1558862150
Side View
Table 58.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 59.1%

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: £980 GBP|Low: £902 GBP|High: £1,948 GBP|Avg: £1,214 GBP|-5.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 5£902 GBP
Retailer 7£937 GBP
Retailer 1£980 GBP
Retailer 6£1,091 GBP
Retailer 2£1,143 GBP
Retailer 3£1,233 GBP
Retailer 4£1,846 GBP

42 data points across 7 retailers

10 retailers£902 GBP to £1,846 GBP

A
Cheapest Retailer
-
£902 GBP
A
Retailer 2
-
£937 GBP
View
A
Retailer 3
-
£980 GBP
View
A
Retailer 4
-
£1,091 GBP
View
Retailer 5
-
£1,106 GBP
View
Price last confirmed 45 days ago
B+
Retailer 6
-
£1,143 GBP
View
B+
Retailer 7
-
£1,233 GBP
View
Retailer 8
-
£1,276 GBP
View
Price last confirmed 43 days ago
B
Retailer 9
-
£1,846 GBP
View
Most Expensive
NZ Jewellers
6c466147-c27d-4da2-87de-b71f17e61a03 · Sep 20
£2,697 GBP
$3,610 USD
View
Price last confirmed 46 days ago
9 more retailers have this diamond
Prices start from £902 GBPSave up to £944 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
£902 GBP