CaratHunter
Plans
Heart|Natural|GIA

0.51ct H SI1 Heart Natural Diamond

EX • H/SI1 • GIA 3545408166

Certificate GIA 3545408166

Diamond specifications and retailer prices

From £296 GBP
As of November 6, 2026
Save £575 GBP (66%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £1,199 GBP at NZ Jewellers · As of September 25, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 3545408166. Listed at 13 retailers as of November 4, 2026, with a 194% 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

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

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
Pavilion angle42°
OriginNatural
Grading LabGIA
CertificateGIA 3545408166
Dimensions4.87 × 5.71 × 3.35 mm
L/W Ratio1.17
Top View
4.87 mm5.71 mm0.51 ctH / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateGIA 3545408166
Side View
Table 59.0%CrownGirdle: MED-VTKPavilion 42°Culet: NoneDepth 58.7%

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: £380 GBP|Low: £253 GBP|High: £929 GBP|Avg: £481 GBP|-6.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 12£296 GBP
Retailer 2£344 GBP
Retailer 3£348 GBP
Retailer 7£360 GBP
Retailer 5£371 GBP
Retailer 1£380 GBP
Retailer 6£405 GBP
Retailer 10£526 GBP
Retailer 11£527 GBP
Retailer 8£586 GBP
Retailer 4£593 GBP
Retailer 9£870 GBP

36 data points across 12 retailers

13 retailers£296 GBP to £870 GBP

A
Cheapest Retailer
-
£296 GBP
A
Retailer 2
-
£344 GBP
View
B+
Retailer 3
-
£348 GBP
View
Final sale: no returns
A
Retailer 4
-
£360 GBP
View
A
Retailer 5
-
£371 GBP
View
B+
Retailer 6
-
£380 GBP
View
B+
Retailer 7
-
£405 GBP
View
B+
Retailer 8
-
£526 GBP
View
B+
Retailer 9
-
£527 GBP
View
B
Retailer 10
-
£586 GBP
View
Retailer 11
-
£593 GBP
View
Price last confirmed 34 days ago
B
Retailer 12
-
£870 GBP
View
Most Expensive
NZ Jewellers
90cec75c-5fc3-44e1-aea5-17ebe829a068 · Sep 25
£1,199 GBP
$1,605 USD
View
Price under review
12 more retailers have this diamond
Prices start from £296 GBPSave up to £575 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
£296 GBP