CaratHunter
Plans
Round|Natural|GIA

0.51ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 7551171595

Certificate GIA 7551171595

Diamond specifications and retailer prices

From £460 GBP
As of November 4, 2026
Save £548 GBP (54%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,727 GBP at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

About this 0.51ct natural round diamond

This 0.51ct natural round sits in the half to three-quarter carat band, graded H colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 7551171595. Listed at 14 retailers as of November 4, 2026, with a 119% 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.5°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 7551171595
Dimensions5.12 × 5.14 × 3.17 mm
L/W Ratio1.00
Girdle conditionSlightly Thick
Culet sizeNone
Key to symbols
Cloud, Crystal, Feather
Top View
5.12 mm5.14 mm0.51 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 7551171595
Side View
Table 59.0%Crown 33.5°Girdle: MED-STKPavilion 41.8°Culet: NoneDepth 61.8%

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 4
Current: £709 GBP|Low: £422 GBP|High: £1,448 GBP|Avg: £779 GBP|-1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 8£460 GBP
Retailer 9£490 GBP
Retailer 6£499 GBP
Retailer 2£651 GBP
Retailer 7£693 GBP
Retailer 1£709 GBP
Retailer 4£778 GBP
Retailer 3£1,007 GBP
Retailer 5£1,444 GBP

39 data points across 9 retailers

14 retailers£460 GBP to £1,007 GBP

Retailer 1
-
£445 GBP
Price last confirmed 26 days ago
A
Retailer 2
-
£460 GBP
View
Final sale: no returns
A
Retailer 3
-
£490 GBP
View
Retailer 4
-
£499 GBP
View
Price last confirmed 8 days ago
Retailer 5
-
£518 GBP
View
Price last confirmed 15 days ago
B+
Retailer 6
-
£580 GBP
View
B+
Retailer 7
-
£651 GBP
View
Retailer 8
-
£693 GBP
View
Price last confirmed 9 days ago
B+
Retailer 9
-
£709 GBP
View
B
Retailer 10
-
£778 GBP
View
B
Retailer 11
-
£1,007 GBP
View
Retailer 12
-
£1,444 GBP
View
Price last confirmed 9 days ago
Retailer 13
-
£1,727 GBP
View
Price under review
Most Expensive
NZ Jewellers
749d0a12-d6c4-428d-8d95-e05061ffa3c9 · Oct 17
£1,727 GBP
$2,325 USD
View
Price under review
13 more retailers have this diamond
Prices start from £460 GBPSave up to £548 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 Round
£460 GBP