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Oval|Natural|IGI

0.51ct H SI1 Oval Natural Diamond

VG • H/SI1 • IGI 815674622

Shape and cutting style on the report: Oval brilliant

Certificate IGI 815674622

Diamond specifications and retailer prices

From £427 GBP
As of November 6, 2026
Save £643 GBP (60%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £1,455 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI 815674622. Listed at 13 retailers as of November 4, 2026, with a 150% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
H
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle31.1°
Pavilion angle38.6°
OriginNatural
Grading LabIGI
CertificateIGI 815674622
Dimensions6.45 × 4.48 × 2.65 mm
L/W Ratio1.44
Girdle conditionFaceted
Culet sizeNone
Top View
6.45 mm4.48 mm0.51 ctH / SI1
OriginNatural
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI 815674622
Side View
Table 59.0%Crown 31.1°Girdle: STK-THKPavilion 38.6°Culet: NoneDepth 59.2%

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 6
Current: £1,455 GBP|Low: £427 GBP|High: £1,455 GBP|Avg: £708 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 12£427 GBP
Retailer 3£464 GBP
Retailer 10£500 GBP
Retailer 11£527 GBP
Retailer 5£536 GBP
Retailer 4£562 GBP
Retailer 2£566 GBP
Retailer 6£582 GBP
Retailer 9£622 GBP
Retailer 7£716 GBP
Retailer 13£996 GBP
Retailer 8£1,070 GBP
NZ Jewellers£1,455 GBP

42 data points across 13 retailers

13 retailers£427 GBP to £1,070 GBP

B+
Cheapest Retailer
-
£427 GBP
Final sale: no returns
B+
Retailer 2
-
£464 GBP
View
B+
Retailer 3
-
£500 GBP
View
B+
Retailer 4
-
£527 GBP
View
B
Retailer 5
-
£536 GBP
View
B
Retailer 6
-
£562 GBP
View
B
Retailer 7
-
£566 GBP
View
B
Retailer 8
-
£582 GBP
View
B
Retailer 9
-
£622 GBP
View
B
Retailer 10
-
£716 GBP
View
C
Retailer 11
-
£996 GBP
View
B
Retailer 12
-
£1,070 GBP
View
Most Expensive
NZ Jewellers
45561710-6261-4c8f-814a-6e41483f6e9d · Nov 5
£1,455 GBP
$1,948 USD
View
Price under review
12 more retailers have this diamond
Prices start from £427 GBPSave up to £643 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 Oval
£427 GBP