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Round|Natural|GIA

0.51ct K I2 Round Natural Diamond

EX • K/I2 • GIA 6435018245

Certificate GIA 6435018245

Diamond specifications and retailer prices

From £273 GBP
As of November 5, 2026
Save £776 GBP (74%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £1,049 GBP at NZ Jewellers · As of November 4, 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 K colour (faint-tinted) and I2 clarity (included), with a top-tier cut grade and certified by GIA 6435018245. Listed at 6 retailers as of November 4, 2026, with prices from £273 to £1,049, a £776 spread on the same certified stone. NZ Jewellers lists it at £1,049. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

0.51
Carat
K
Colour
I2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6435018245
Dimensions5.18 × 5.22 × 3.12 mm
L/W Ratio1.01
Top View
5.18 mm5.22 mm0.51 ctK / I2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6435018245
Side View
Table 59.0%Crown 33.5°GirdlePavilion 40.8°Culet: NoneDepth 59.9%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £1,049 GBP|Low: £273 GBP|High: £1,049 GBP|Avg: £438 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 5, 2026
Retailer 5£273 GBP
Retailer 4£295 GBP
Retailer 3£305 GBP
Retailer 7£308 GBP
Retailer 6£369 GBP
Retailer 2£497 GBP
NZ Jewellers£1,049 GBP

19 data points across 7 retailers

6 retailers£273 GBP to £1,049 GBP

B+
Cheapest Retailer
-
£273 GBP
Retailer 2
-
£295 GBP
View
Price last confirmed 8 days ago
B+
Retailer 3
-
£305 GBP
View
B
Retailer 4
-
£369 GBP
View
B
Retailer 5
-
£497 GBP
View
Most Expensive
C
NZ Jewellers
4aa39cd8-961c-43bb-bd2b-a639e88a2684 · Nov 4
£1,049 GBP
$1,412 USD
View
5 more retailers have this diamond
Prices start from £273 GBPSave up to £776 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.

B+
0.51ct Round
£273 GBP