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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 $1,599 NZD
$901 USD
As of October 31, 2026
Save $1,905 NZD (54%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $4,665 NZD 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 17 retailers as of October 31, 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: $4,665 NZD|Low: $1,332 NZD|High: $4,665 NZD|Avg: $2,402 NZD
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
Retailer 14
November 1, 2026
Retailer 12$1,599 NZD
Retailer 2$1,686 NZD
Retailer 11$1,696 NZD
Retailer 3$1,718 NZD
Retailer 4$1,733 NZD
Retailer 6$1,733 NZD
Retailer 14$1,799 NZD
Retailer 5$2,000 NZD
Retailer 8$2,257 NZD
Retailer 13$2,501 NZD
Retailer 9$2,683 NZD
Retailer 10$2,952 NZD
Retailer 7$3,504 NZD
NZ Jewellers$4,665 NZD

45 data points across 14 retailers

17 retailers$1,599 NZD to $3,504 NZD

B+
Cheapest Retailer
-
$1,599 NZD
$901 USD
Final sale: no returns
B+
Retailer 2
-
$1,686 NZD
$950 USD
View
B+
Retailer 3
-
$1,696 NZD
$956 USD
View
B+
Retailer 4
-
$1,702 NZD
$959 USD
View
B+
Retailer 5
-
$1,703 NZD
$960 USD
View
B+
Retailer 6
-
$1,718 NZD
$968 USD
View
B+
Retailer 7
-
$1,733 NZD
$977 USD
View
B+
Retailer 8
-
$1,733 NZD
$977 USD
View
B+
Retailer 9
-
$1,799 NZD
$1,014 USD
View
B+
Retailer 10
-
$2,000 NZD
$1,127 USD
View
B
Retailer 11
-
$2,257 NZD
£1,001 GBP
View
Retailer 12
-
$2,501 NZD
A$2,168 AUD
View
Price last confirmed 28 days ago
B
Retailer 13
-
$2,683 NZD
€1,440 EUR
View
B
Retailer 14
-
$2,952 NZD
ZAR 26,882 ZAR
View
B
Retailer 15
-
$3,101 NZD
CA$2,428 CAD
View
B
Retailer 16
-
$3,504 NZD
£1,555 GBP
View
Most Expensive
NZ Jewellers
07e8e85c-3b95-4719-b79a-7ebc14a03306 · Oct 30
$4,665 NZD
$2,629 USD
View
Price under review
16 more retailers have this diamond
Prices start from $1,599 NZDSave up to $1,905 NZD

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
$1,599 NZD