Round|Natural|GIA

0.51ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 6431323124

Certificate GIA 6431323124

Diamond specifications and retailer prices

From £308 GBP
As of November 6, 2026
Save £777 GBP (72%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £1,318 GBP at NZ Jewellers · As of September 15, 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 6431323124. Listed at 20 retailers as of November 6, 2026, with a 253% 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
FluorescenceFaint
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6431323124
Dimensions5.14 × 5.12 × 3.20 mm
L/W Ratio1.00
Top View
5.14 mm5.12 mm0.51 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6431323124
Side View
Table 58.0%Crown 36°Girdle: MED-MEDPavilion 41°Culet: NoneDepth 62.4%

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 6
Current: £308 GBP|Low: £308 GBP|High: £982 GBP|Avg: £518 GBP|-2.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 1£308 GBP
Retailer 2£388 GBP
Retailer 10£397 GBP
Retailer 7£420 GBP
Retailer 9£452 GBP
Retailer 5£507 GBP
Retailer 6£523 GBP
Retailer 3£540 GBP
Retailer 4£563 GBP
Retailer 8£969 GBP

32 data points across 10 retailers

20 retailers£308 GBP to £1,085 GBP

A
Cheapest Retailer
-
£308 GBP
A
Retailer 2
-
£388 GBP
View
Final sale: no returns
A
Retailer 3
-
£397 GBP
View
A
Retailer 4
-
£420 GBP
View
Retailer 5
-
£421 GBP
View
Price last confirmed 53 days ago
Retailer 6
-
£452 GBP
View
Price last confirmed 8 days ago
A
Retailer 7
-
£452 GBP
View
Retailer 8
-
£452 GBP
View
Price last confirmed 22 days ago
Retailer 9
-
£452 GBP
View
Price last confirmed 21 days ago
Retailer 10
-
£452 GBP
View
Price last confirmed 9 days ago
Retailer 11
-
£485 GBP
View
Price last confirmed 53 days ago
B+
Retailer 12
-
£507 GBP
View
B+
Retailer 13
-
£507 GBP
View
B+
Retailer 14
-
£518 GBP
View
B+
Retailer 15
-
£523 GBP
View
B+
Retailer 16
-
£540 GBP
View
B+
Retailer 17
-
£563 GBP
View
B
Retailer 18
-
£969 GBP
View
B
Retailer 19
-
£1,085 GBP
View
Most Expensive
NZ Jewellers
d344b10c-328b-4fa8-877e-b610de254c39 · Sep 15
£1,318 GBP
$1,774 USD
View
Price last confirmed 52 days ago
19 more retailers have this diamond
Prices start from £308 GBPSave up to £777 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
£308 GBP