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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 $1,283 AUD
$901 USD
As of October 31, 2026
Save $1,532 AUD (54%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $3,743 AUD 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: $3,743 AUD|Low: $1,069 AUD|High: $3,743 AUD|Avg: $1,929 AUD
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$1,283 AUD
Retailer 9$1,361 AUD
Retailer 13$1,378 AUD
Retailer 3$1,391 AUD
Retailer 5$1,391 AUD
Retailer 12$1,444 AUD
Retailer 4$1,604 AUD
Retailer 2$1,811 AUD
Retailer 11$2,007 AUD
Retailer 6$2,152 AUD
Retailer 7$2,369 AUD
Retailer 8$2,815 AUD
NZ Jewellers$3,743 AUD

44 data points across 13 retailers

16 retailers$1,283 AUD to $2,815 AUD

B+
Cheapest Retailer
-
$1,283 AUD
$901 USD
Final sale: no returns
B+
Retailer 2
-
$1,361 AUD
$956 USD
View
B+
Retailer 3
-
$1,365 AUD
$959 USD
View
B+
Retailer 4
-
$1,367 AUD
$960 USD
View
B+
Retailer 5
-
$1,378 AUD
$968 USD
View
B+
Retailer 6
-
$1,391 AUD
$977 USD
View
B+
Retailer 7
-
$1,391 AUD
$977 USD
View
B+
Retailer 8
-
$1,444 AUD
$1,014 USD
View
B+
Retailer 9
-
$1,604 AUD
$1,127 USD
View
B
Retailer 10
-
$1,811 AUD
£1,001 GBP
View
Retailer 11
-
$2,007 AUD
View
Price last confirmed 28 days ago
B
Retailer 12
-
$2,152 AUD
€1,440 EUR
View
B
Retailer 13
-
$2,369 AUD
ZAR 26,882 ZAR
View
B
Retailer 14
-
$2,488 AUD
CA$2,428 CAD
View
B
Retailer 15
-
$2,815 AUD
£1,557 GBP
View
Most Expensive
NZ Jewellers
07e8e85c-3b95-4719-b79a-7ebc14a03306 · Oct 30
$3,743 AUD
$2,629 USD
View
Price under review
15 more retailers have this diamond
Prices start from $1,283 AUDSave up to $1,532 AUD

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
$1,283 AUD