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Heart|Natural|GIA

1.51ct K SI2 Heart Natural Diamond

EX • K/SI2 • GIA 6531540681

Certificate GIA 6531540681

Diamond specifications and retailer prices

From £2,125 GBP
As of November 1, 2026
Save £2,317 GBP (52%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £4,442 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 SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6531540681. Listed at 6 retailers as of November 1, 2026, with prices from £2,125 to £4,442, a £2,317 spread on the same certified stone. NZ Jewellers lists it at £4,442. 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
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.46°
Pavilion angle40.31°
OriginNatural
Grading LabGIA
CertificateGIA 6531540681
Dimensions7.34 × 7.96 × 4.58 mm
L/W Ratio1.08
Girdle conditionThick
Key to symbols
Twinning Wisp, Feather, Crystal, Cloud, Cavity, Needle, Indented Natural
Top View
7.34 mm7.96 mm1.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6531540681
Side View
Table 61.0%Crown 37.46°Girdle: STK-THKPavilion 40.31°Culet: NoneDepth 57.6%

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 1
Current: £4,442 GBP|Low: £2,043 GBP|High: £4,486 GBP|Avg: £2,683 GBP|-1.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 7£2,043 GBP
Retailer 4£2,125 GBP
Retailer 2£2,129 GBP
Retailer 5£2,206 GBP
Retailer 6£2,235 GBP
Retailer 8£2,412 GBP
Retailer 9£2,623 GBP
Retailer 3£3,722 GBP
NZ Jewellers£4,442 GBP

29 data points across 9 retailers

6 retailers£2,125 GBP to £4,442 GBP

A
Cheapest Retailer
-
£2,125 GBP
A
Retailer 2
-
£2,129 GBP
View
A
Retailer 3
-
£2,206 GBP
View
A
Retailer 4
-
£2,235 GBP
View
B
Retailer 5
-
£3,722 GBP
View
Most Expensive
B
NZ Jewellers
7388c1ca-8739-4153-b9d9-457d8c0a68ab · Nov 3
£4,442 GBP
$5,945 USD
View
5 more retailers have this diamond
Prices start from £2,125 GBPSave up to £2,317 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
£2,125 GBP