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Round|Natural|GIA

0.51ct K SI2 Round Natural Diamond

VG • K/SI2 • GIA 6291362550

Certificate GIA 6291362550

Diamond specifications and retailer prices

From $530 AUD
As of November 1, 2026
Save $893 AUD (63%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $2,363 AUD at NZ Jewellers · As of October 30, 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 K colour (faint-tinted) and SI2 clarity (slightly-included), with a very-good cut grade and certified by GIA 6291362550. Listed at 14 retailers as of November 1, 2026, with a 168% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
K
Colour
SI2
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6291362550
Dimensions5.01 × 4.98 × 3.21 mm
L/W Ratio1.01
Top View
5.01 mm4.98 mm0.51 ctK / SI2
OriginNatural
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6291362550
Side View
Table 57.0%CrownGirdle: THN-THKPavilionCulet: NoneDepth 64.2%

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: Nov 1
Current: $2,363 AUD|Low: $439 AUD|High: $2,363 AUD|Avg: $793 AUD|+21.7%
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
Retailer 15
Retailer 16
November 2, 2026
Retailer 15$530 AUD
Retailer 7$584 AUD
Retailer 16$617 AUD
Retailer 5$644 AUD
Retailer 2$654 AUD
Retailer 4$664 AUD
Retailer 6$664 AUD
Retailer 3$711 AUD
Retailer 12$711 AUD
Retailer 9$760 AUD
Retailer 14$803 AUD
Retailer 8$836 AUD
Retailer 13$840 AUD
Retailer 10$933 AUD
Retailer 11$1,423 AUD
NZ Jewellers$2,363 AUD

26 data points across 16 retailers

14 retailers$530 AUD to $1,423 AUD

B+
Cheapest Retailer
-
$530 AUD
B+
Retailer 2
-
$617 AUD
View
Retailer 3
-
$644 AUD
View
Price last confirmed 10 days ago
B+
Retailer 4
-
$654 AUD
View
Retailer 5
-
$664 AUD
View
Price last confirmed 9 days ago
Retailer 6
-
$664 AUD
View
Price last confirmed 8 days ago
B+
Retailer 7
-
$711 AUD
View
B+
Retailer 8
-
$711 AUD
View
B+
Retailer 9
-
$760 AUD
View
B+
Retailer 10
-
$803 AUD
View
B
Retailer 11
-
$840 AUD
View
B
Retailer 12
-
$933 AUD
View
C
Retailer 13
-
$1,423 AUD
View
Most Expensive
NZ Jewellers
dd197ee9-5caf-4acd-8558-c99939f4f2f5 · Oct 30
$2,363 AUD
$1,654 USD
View
Price last confirmed 7 days ago
13 more retailers have this diamond
Prices start from $530 AUDSave up to $893 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 Round
$530 AUD