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Heart|Natural|GIA

0.51ct G SI1 Heart Natural Diamond

VG • G/SI1 • GIA 6515727921

Certificate GIA 6515727921

Diamond specifications and retailer prices

From £378 GBP
As of November 6, 2026
Save £663 GBP (64%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £1,413 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 G colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 6515727921. Listed at 18 retailers as of November 2, 2026, with a 175% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
G
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.4°
Pavilion angle37.8°
OriginNatural
Grading LabGIA
CertificateGIA 6515727921
Dimensions5.69 × 5.07 × 2.76 mm
L/W Ratio1.12
Top View
5.69 mm5.07 mm0.51 ctG / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6515727921
Side View
Table 56.0%Crown 36.4°Girdle: STK-THKPavilion 37.8°Culet: NoneDepth 54.5%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £1,413 GBP|Low: £378 GBP|High: £1,797 GBP|Avg: £617 GBP|-21.4%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
November 6, 2026
Retailer 18£378 GBP
Retailer 4£403 GBP
Retailer 7£415 GBP
Retailer 12£436 GBP
Retailer 5£451 GBP
Retailer 9£485 GBP
Retailer 17£485 GBP
Retailer 19£520 GBP
Retailer 13£548 GBP
Retailer 6£548 GBP
Retailer 2£550 GBP
Retailer 8£553 GBP
Retailer 16£564 GBP
Retailer 3£594 GBP
Retailer 10£624 GBP
Retailer 14£695 GBP
Retailer 11£793 GBP
Retailer 15£1,041 GBP
NZ Jewellers£1,413 GBP

22 data points across 19 retailers

18 retailers£378 GBP to £1,041 GBP

A
Cheapest Retailer
-
£378 GBP
B+
Retailer 2
-
£403 GBP
View
B+
Retailer 3
-
£415 GBP
View
Final sale: no returns
B+
Retailer 4
-
£436 GBP
View
B+
Retailer 5
-
£451 GBP
View
Retailer 6
-
£485 GBP
View
Price last confirmed 9 days ago
B
Retailer 7
-
£485 GBP
View
B+
Retailer 8
-
£520 GBP
View
B
Retailer 9
-
£548 GBP
View
B
Retailer 10
-
£548 GBP
View
B+
Retailer 11
-
£550 GBP
View
B
Retailer 12
-
£553 GBP
View
B
Retailer 13
-
£564 GBP
View
B
Retailer 14
-
£594 GBP
View
B
Retailer 15
-
£624 GBP
View
B
Retailer 16
-
£695 GBP
View
B
Retailer 17
-
£1,041 GBP
View
Most Expensive
NZ Jewellers
94ee7a14-1ad9-4429-8ee3-e09098f90f44 · Nov 5
£1,413 GBP
$1,891 USD
View
Price under review
17 more retailers have this diamond
Prices start from £378 GBPSave up to £663 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
£378 GBP