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Oval|Natural|IGI

0.51ct K SI1 Oval Natural Diamond

VG • K/SI1 • IGI 815673855

Shape and cutting style on the report: Oval brilliant

Certificate IGI 815673855

Diamond specifications and retailer prices

From £241 GBP
As of November 6, 2026
Save £1,008 GBP (81%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,249 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 815673855. Listed at 14 retailers as of November 5, 2026, with prices from £241 to £1,249, a £1,008 spread on the same certified stone. NZ Jewellers lists it at £1,249. 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
SymmetryVery Good
FluorescenceNone
Crown angle30.7°
Pavilion angle40.4°
OriginNatural
Grading LabIGI
CertificateIGI 815673855
Dimensions6.30 × 4.62 × 2.77 mm
L/W Ratio1.36
Girdle conditionFaceted
Top View
6.30 mm4.62 mm0.51 ctK / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI 815673855
Side View
Table 60.0%Crown 30.7°Girdle: MED-THKPavilion 40.4°Culet: NoneDepth 60.0%

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 6
Current: £1,249 GBP|Low: £241 GBP|High: £1,249 GBP|Avg: £466 GBP
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
November 6, 2026
Retailer 2£241 GBP
Retailer 13£326 GBP
Retailer 11£351 GBP
Retailer 12£351 GBP
Retailer 4£374 GBP
Retailer 3£376 GBP
Retailer 6£397 GBP
Retailer 8£416 GBP
Retailer 5£452 GBP
Retailer 9£505 GBP
Retailer 7£532 GBP
Retailer 10£751 GBP
NZ Jewellers£1,249 GBP

26 data points across 13 retailers

14 retailers£241 GBP to £1,249 GBP

A
Cheapest Retailer
-
£241 GBP
B+
Retailer 2
-
£326 GBP
View
B+
Retailer 3
-
£351 GBP
View
Retailer 4
-
£351 GBP
View
Price last confirmed 8 days ago
B+
Retailer 5
-
£374 GBP
View
B+
Retailer 6
-
£376 GBP
View
B+
Retailer 7
-
£397 GBP
View
B+
Retailer 8
-
£416 GBP
View
B+
Retailer 9
-
£424 GBP
View
B
Retailer 10
-
£452 GBP
View
B
Retailer 11
-
£505 GBP
View
B
Retailer 12
-
£532 GBP
View
B
Retailer 13
-
£751 GBP
View
Most Expensive
C
NZ Jewellers
f006e734-a583-408a-b002-81a75b2f699f · Nov 5
£1,249 GBP
$1,672 USD
View
13 more retailers have this diamond
Prices start from £241 GBPSave up to £1,008 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
£241 GBP