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Round|Natural|IGI

0.51ct K SI2 Round Natural Diamond

EX • K/SI2 • IGI 670418814

Shape and cutting style on the report: Round brilliant

Certificate IGI 670418814

Diamond specifications and retailer prices

From £204 GBP
As of November 5, 2026
Save £721 GBP (78%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £926 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI 670418814. Listed at 13 retailers as of November 4, 2026, with prices from £204 to £926, a £721 spread on the same certified stone. NZ Jewellers lists it at £926. 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
K
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle32.5°
Pavilion angle40.8°
OriginNatural
Grading LabIGI
CertificateIGI 670418814
Dimensions5.15 × 5.12 × 3.14 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
5.15 mm5.12 mm0.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI 670418814
Side View
Table 57.0%Crown 32.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.2%

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 5
Current: £288 GBP|Low: £204 GBP|High: £477 GBP|Avg: £291 GBP|+5.2%
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 5, 2026
Retailer 4£204 GBP
Retailer 6£212 GBP
Retailer 9£215 GBP
Retailer 11£220 GBP
Retailer 8£256 GBP
Retailer 1£288 GBP
Retailer 2£301 GBP
Retailer 10£301 GBP
Retailer 3£307 GBP
Retailer 12£334 GBP
Retailer 5£391 GBP
Retailer 7£472 GBP

23 data points across 12 retailers

13 retailers£204 GBP to £926 GBP

A
Cheapest Retailer
-
£204 GBP
A
Retailer 2
-
£212 GBP
View
Retailer 3
-
£220 GBP
View
Price last confirmed 8 days ago
A
Retailer 4
-
£228 GBP
View
Retailer 5
-
£256 GBP
View
Price last confirmed 42 days ago
Retailer 6
-
£275 GBP
View
Price last confirmed 63 days ago
B+
Retailer 7
-
£275 GBP
View
B+
Retailer 8
-
£288 GBP
View
B+
Retailer 9
-
£301 GBP
View
B+
Retailer 10
-
£391 GBP
View
B+
Retailer 11
-
£472 GBP
View
Retailer 12
-
£926 GBP
View
Price last confirmed 66 days ago
Most Expensive
C
NZ Jewellers
6f82cb98-7cb0-4025-b245-448f57a419c4 · Nov 4
£926 GBP
$1,246 USD
View
12 more retailers have this diamond
Prices start from £204 GBPSave up to £721 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
£204 GBP