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Heart|Natural|GIA

0.51ct K SI1 Heart Natural Diamond

EX • K/SI1 • GIA 5231856783

Certificate GIA 5231856783

Diamond specifications and retailer prices

From £358 GBP
As of November 5, 2026
Save £1,012 GBP (74%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £1,370 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 0.51ct natural heart diamond

This 0.51ct natural heart sits in the half to three-quarter 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 5231856783. Listed at 11 retailers as of November 5, 2026, with prices from £358 to £1,370, a £1,012 spread on the same certified stone. NZ Jewellers lists it at £1,370. 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

0.51
Carat
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryGood
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 5231856783
Dimensions4.69 × 5.47 × 3.40 mm
L/W Ratio1.17
Top View
4.69 mm5.47 mm0.51 ctK / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryGood
FluorescenceMedium
CertificateGIA 5231856783
Side View
Table 55.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 62.0%

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 5
Current: £1,370 GBP|Low: £358 GBP|High: £1,370 GBP|Avg: £563 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 10£358 GBP
Retailer 9£385 GBP
Retailer 11£395 GBP
Retailer 4£409 GBP
Retailer 5£409 GBP
Retailer 2£432 GBP
Retailer 3£465 GBP
Retailer 8£512 GBP
Retailer 6£554 GBP
Retailer 7£824 GBP
NZ Jewellers£1,370 GBP

45 data points across 11 retailers

11 retailers£358 GBP to £1,370 GBP

A
Cheapest Retailer
-
£358 GBP
B+
Retailer 2
-
£385 GBP
View
B+
Retailer 3
-
£409 GBP
View
B+
Retailer 4
-
£409 GBP
View
B+
Retailer 5
-
£432 GBP
View
B
Retailer 6
-
£465 GBP
View
B
Retailer 7
-
£484 GBP
View
B
Retailer 8
-
£512 GBP
View
B
Retailer 9
-
£554 GBP
View
B
Retailer 10
-
£824 GBP
View
Most Expensive
C
NZ Jewellers
31f6a0a0-52ac-48c8-8fcf-10c7aa63085e · Nov 5
£1,370 GBP
$1,834 USD
View
10 more retailers have this diamond
Prices start from £358 GBPSave up to £1,012 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
0.51ct Heart
£358 GBP