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Heart|Natural|HRD

1.51ct K SI1 Heart Natural Diamond

EX • K/SI1 • HRD 250000199722

Certificate HRD 250000199722

Diamond specifications and retailer prices

From £1,815 GBP
As of November 6, 2026
Save £2,094 GBP (54%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £3,909 GBP at NZ Jewellers · As of November 3, 2026
View at NZ Jewellers

About this 1.51ct natural heart diamond

This 1.51ct natural heart sits in the one-and-a-half to two 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 HRD 250000199722. Listed at 5 retailers as of November 3, 2026, with prices from £1,815 to £3,909, a £2,094 spread on the same certified stone. NZ Jewellers lists it at £3,909. 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

1.51
Carat
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle35.03°
Pavilion angle40.1°
OriginNatural
Grading LabHRD
CertificateHRD 250000199722
Dimensions6.97 × 8.20 × 4.61 mm
L/W Ratio1.18
Girdle conditionMedium
Top View
6.97 mm8.20 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateHRD 250000199722
Side View
Table 63.0%Crown 35.03°GirdlePavilion 40.1°CuletDepth 56.2%

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: £3,909 GBP|Low: £1,815 GBP|High: £4,048 GBP|Avg: £2,601 GBP|-3.4%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 1, 2026
Retailer 5£1,815 GBP
Retailer 3£1,870 GBP
Retailer 4£1,956 GBP
Retailer 6£2,347 GBP
Retailer 2£3,276 GBP
NZ Jewellers£3,909 GBP

15 data points across 6 retailers

5 retailers£1,815 GBP to £3,909 GBP

A
Cheapest Retailer
-
£1,815 GBP
A
Retailer 2
-
£1,870 GBP
View
B+
Retailer 3
-
£1,956 GBP
View
B
Retailer 4
-
£3,276 GBP
View
Most Expensive
B
NZ Jewellers
1a115bc5-5eb3-444d-a044-44d98997dc21 · Nov 3
£3,909 GBP
$5,232 USD
View
4 more retailers have this diamond
Prices start from £1,815 GBPSave up to £2,094 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
1.51ct Heart
£1,815 GBP