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Oval|Natural|GIA

0.51ct H SI1 Oval Natural Diamond

EX • H/SI1 • GIA 5556394112

Certificate GIA 5556394112

Diamond specifications and retailer prices

From £403 GBP
As of November 6, 2026
Save £402 GBP (50%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £1,659 GBP at Diamond Exchange Canada · As of November 5, 2026
View at Diamond Exchange Canada

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 top-tier cut grade stated by the retailer rather than the lab and certified by GIA 5556394112. Listed at 10 retailers as of November 6, 2026, with a 100% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
H
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 5556394112
Dimensions6.57 × 4.47 × 2.70 mm
L/W Ratio1.47
Culet sizeNone
Key to symbols
Cloud
Top View
6.57 mm4.47 mm0.51 ctH / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 5556394112
Side View
Table 63.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 60.3%

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: £787 GBP|Low: £366 GBP|High: £1,802 GBP|Avg: £806 GBP|+1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 4£403 GBP
Retailer 5£554 GBP
Retailer 8£601 GBP
Retailer 2£691 GBP
Retailer 3£743 GBP
Retailer 1£787 GBP
Retailer 6£805 GBP
Retailer 9£871 GBP
Retailer 7£1,802 GBP

43 data points across 9 retailers

10 retailers£403 GBP to £805 GBP

A
Cheapest Retailer
-
£403 GBP
Final sale: no returns
B+
Retailer 2
-
£531 GBP
View
B+
Retailer 3
-
£554 GBP
View
B+
Retailer 4
-
£640 GBP
View
B
Retailer 5
-
£691 GBP
View
B
Retailer 6
-
£731 GBP
View
B
Retailer 7
-
£743 GBP
View
B
Retailer 8
-
£787 GBP
View
B
Retailer 9
-
£805 GBP
View
Most Expensive
Diamond Exchange Canada
1962132016 · Nov 5
£1,659 GBP
CA$3,084 CAD
View
Price under review
9 more retailers have this diamond
Prices start from £403 GBPSave up to £402 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
£403 GBP