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Round|Natural|GIA

0.51ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 6431323124

Certificate GIA 6431323124

Diamond specifications and retailer prices

From $747 NZD
As of November 6, 2026
Save $1,887 NZD (72%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $3,200 NZD at NZ Jewellers · As of September 15, 2026
View at NZ Jewellers

About this 0.51ct natural round diamond

This 0.51ct natural round sits in the half to three-quarter carat band, graded H colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6431323124. Listed at 20 retailers as of November 6, 2026, with a 253% 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6431323124
Dimensions5.14 × 5.12 × 3.20 mm
L/W Ratio1.00
Top View
5.14 mm5.12 mm0.51 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6431323124
Side View
Table 58.0%Crown 36°Girdle: MED-MEDPavilion 41°Culet: NoneDepth 62.4%

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: $747 NZD|Low: $747 NZD|High: $2,385 NZD|Avg: $1,257 NZD|-2.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 1$747 NZD
Retailer 2$942 NZD
Retailer 10$965 NZD
Retailer 7$1,019 NZD
Retailer 9$1,099 NZD
Retailer 5$1,232 NZD
Retailer 6$1,270 NZD
Retailer 3$1,311 NZD
Retailer 4$1,367 NZD
Retailer 8$2,352 NZD

32 data points across 10 retailers

20 retailers$747 NZD to $2,634 NZD

A
Cheapest Retailer
-
$747 NZD
A
Retailer 2
-
$942 NZD
View
Final sale: no returns
A
Retailer 3
-
$965 NZD
View
A
Retailer 4
-
$1,019 NZD
View
Retailer 5
-
$1,021 NZD
View
Price last confirmed 53 days ago
Retailer 6
-
$1,099 NZD
View
Price last confirmed 8 days ago
A
Retailer 7
-
$1,099 NZD
View
Retailer 8
-
$1,099 NZD
View
Price last confirmed 22 days ago
Retailer 9
-
$1,099 NZD
View
Price last confirmed 21 days ago
Retailer 10
-
$1,099 NZD
View
Price last confirmed 9 days ago
Retailer 11
-
$1,178 NZD
View
Price last confirmed 53 days ago
B+
Retailer 12
-
$1,230 NZD
View
B+
Retailer 13
-
$1,232 NZD
View
B+
Retailer 14
-
$1,257 NZD
View
B+
Retailer 15
-
$1,270 NZD
View
B+
Retailer 16
-
$1,311 NZD
View
B+
Retailer 17
-
$1,367 NZD
View
B
Retailer 18
-
$2,352 NZD
View
B
Retailer 19
-
$2,634 NZD
View
Most Expensive
NZ Jewellers
d344b10c-328b-4fa8-877e-b610de254c39 · Sep 15
$3,200 NZD
$1,774 USD
View
Price last confirmed 52 days ago
19 more retailers have this diamond
Prices start from $747 NZDSave up to $1,887 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.

A
0.51ct Round
$747 NZD