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Oval|Natural|IGI

0.51ct K SI1 Oval Natural Diamond

VG • K/SI1 • IGI 815656298

Shape and cutting style on the report: Oval brilliant

Certificate IGI 815656298

Diamond specifications and retailer prices

From £285 GBP
As of November 5, 2026
Save £916 GBP (76%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,201 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 0.51ct natural oval diamond

This 0.51ct natural oval sits in the half to three-quarter carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI 815656298. Listed at 15 retailers as of November 5, 2026, with prices from £285 to £1,201, a £916 spread on the same certified stone. NZ Jewellers lists it at £1,201. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
K
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle39.5°
Pavilion angle35.6°
OriginNatural
Grading LabIGI
CertificateIGI 815656298
Dimensions6.30 × 4.40 × 2.75 mm
L/W Ratio1.43
Girdle conditionFaceted
Top View
6.30 mm4.40 mm0.51 ctK / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateIGI 815656298
Side View
Table 58.0%Crown 39.5°Girdle: MED-THKPavilion 35.6°Culet: NoneDepth 62.5%

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: £1,201 GBP|Low: £285 GBP|High: £1,227 GBP|Avg: £471 GBP|-2.1%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
November 6, 2026
Retailer 11£285 GBP
Retailer 7£291 GBP
Retailer 12£313 GBP
Retailer 13£338 GBP
Retailer 6£341 GBP
Retailer 10£362 GBP
Retailer 9£363 GBP
Retailer 3£366 GBP
Retailer 2£382 GBP
Retailer 5£433 GBP
Retailer 14£483 GBP
Retailer 15£486 GBP
Retailer 8£505 GBP
Retailer 4£725 GBP
NZ Jewellers£1,201 GBP

18 data points across 15 retailers

15 retailers£285 GBP to £1,201 GBP

A
Cheapest Retailer
-
£285 GBP
Retailer 2
-
£291 GBP
View
Price last confirmed 9 days ago
A
Retailer 3
-
£313 GBP
View
A
Retailer 4
-
£338 GBP
View
Retailer 5
-
£341 GBP
View
Price last confirmed 8 days ago
B+
Retailer 6
-
£362 GBP
View
B+
Retailer 7
-
£363 GBP
View
B+
Retailer 8
-
£366 GBP
View
B+
Retailer 9
-
£382 GBP
View
B+
Retailer 10
-
£433 GBP
View
B
Retailer 11
-
£483 GBP
View
B
Retailer 12
-
£486 GBP
View
B
Retailer 13
-
£505 GBP
View
B
Retailer 14
-
£725 GBP
View
Most Expensive
C
NZ Jewellers
d3d89fb4-5f5c-4fd9-8d0d-1a0c11664320 · Nov 5
£1,201 GBP
$1,607 USD
View
14 more retailers have this diamond
Prices start from £285 GBPSave up to £916 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 Oval
£285 GBP