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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 $591 AUD
As of November 6, 2026
Save $1,494 AUD (72%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $2,534 AUD 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: $591 AUD|Low: $591 AUD|High: $1,888 AUD|Avg: $996 AUD|-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$591 AUD
Retailer 2$746 AUD
Retailer 10$764 AUD
Retailer 7$807 AUD
Retailer 9$870 AUD
Retailer 5$976 AUD
Retailer 6$1,006 AUD
Retailer 3$1,039 AUD
Retailer 4$1,083 AUD
Retailer 8$1,863 AUD

32 data points across 10 retailers

20 retailers$591 AUD to $2,086 AUD

A
Cheapest Retailer
-
$591 AUD
A
Retailer 2
-
$746 AUD
View
Final sale: no returns
A
Retailer 3
-
$764 AUD
View
A
Retailer 4
-
$807 AUD
View
Retailer 5
-
$809 AUD
View
Price last confirmed 53 days ago
Retailer 6
-
$870 AUD
View
Price last confirmed 8 days ago
A
Retailer 7
-
$870 AUD
View
Retailer 8
-
$870 AUD
View
Price last confirmed 22 days ago
Retailer 9
-
$870 AUD
View
Price last confirmed 21 days ago
Retailer 10
-
$870 AUD
View
Price last confirmed 9 days ago
Retailer 11
-
$933 AUD
View
Price last confirmed 53 days ago
B+
Retailer 12
-
$974 AUD
View
B+
Retailer 13
-
$976 AUD
View
B+
Retailer 14
-
$996 AUD
View
B+
Retailer 15
-
$1,006 AUD
View
B+
Retailer 16
-
$1,039 AUD
View
B+
Retailer 17
-
$1,083 AUD
View
B
Retailer 18
-
$1,863 AUD
View
B
Retailer 19
-
$2,086 AUD
View
Most Expensive
NZ Jewellers
d344b10c-328b-4fa8-877e-b610de254c39 · Sep 15
$2,534 AUD
$1,774 USD
View
Price last confirmed 52 days ago
19 more retailers have this diamond
Prices start from $591 AUDSave up to $1,494 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.

A
0.51ct Round
$591 AUD