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Oval|Natural|GIA

0.51ct D SI1 Oval Natural Diamond

EX • D/SI1 • GIA 2518352958

Certificate GIA 2518352958

Diamond specifications and retailer prices

From £672 GBP
$901 USD
As of October 31, 2026
Save £803 GBP (54%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £1,962 GBP at NZ Jewellers · As of October 30, 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2518352958. Listed at 16 retailers as of October 26, 2026, with a 119% 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
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle39.02°
Pavilion angle39.28°
OriginNatural
Grading LabGIA
CertificateGIA 2518352958
Dimensions6.56 × 4.41 × 2.72 mm
L/W Ratio1.49
Top View
6.56 mm4.41 mm0.51 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 2518352958
Side View
Table 58.0%Crown 39.02°Girdle: STK-THKPavilion 39.28°Culet: NoneDepth 61.8%

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: Oct 31
Current: £1,962 GBP|Low: £560 GBP|High: £1,962 GBP|Avg: £1,010 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
October 31, 2026
Retailer 10£672 GBP
Retailer 9£713 GBP
Retailer 13£722 GBP
Retailer 3£729 GBP
Retailer 5£729 GBP
Retailer 12£757 GBP
Retailer 4£841 GBP
Retailer 2£949 GBP
Retailer 11£1,052 GBP
Retailer 6£1,128 GBP
Retailer 7£1,242 GBP
Retailer 8£1,476 GBP
NZ Jewellers£1,962 GBP

45 data points across 13 retailers

16 retailers£672 GBP to £1,476 GBP

B+
Cheapest Retailer
-
£672 GBP
$901 USD
Final sale: no returns
B+
Retailer 2
-
£713 GBP
$956 USD
View
B+
Retailer 3
-
£716 GBP
$959 USD
View
B+
Retailer 4
-
£716 GBP
$960 USD
View
B+
Retailer 5
-
£722 GBP
$968 USD
View
B+
Retailer 6
-
£729 GBP
$977 USD
View
B+
Retailer 7
-
£729 GBP
$977 USD
View
B+
Retailer 8
-
£757 GBP
$1,014 USD
View
B+
Retailer 9
-
£841 GBP
$1,127 USD
View
B
Retailer 10
-
£949 GBP
View
Retailer 11
-
£1,052 GBP
A$2,168 AUD
View
Price last confirmed 27 days ago
B
Retailer 12
-
£1,128 GBP
€1,440 EUR
View
B
Retailer 13
-
£1,242 GBP
ZAR 26,882 ZAR
View
B
Retailer 14
-
£1,304 GBP
CA$2,428 CAD
View
B
Retailer 15
-
£1,476 GBP
View
Most Expensive
NZ Jewellers
07e8e85c-3b95-4719-b79a-7ebc14a03306 · Oct 30
£1,962 GBP
$2,629 USD
View
Price under review
15 more retailers have this diamond
Prices start from £672 GBPSave up to £803 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
£672 GBP