Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1558723449

Certificate GIA 1558723449

Diamond specifications and retailer prices

From $674 AUD
$474 USD
As of October 28, 2026
Save $2,105 AUD (76%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $3,034 AUD at NZ Jewellers · As of October 17, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1558723449. Listed at 20 retailers as of October 27, 2026, with a 312% 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1558723449
Dimensions5.16 × 5.18 × 3.10 mm
L/W Ratio1.00
Culet sizeNone
Key to symbols
Cloud, Feather
Top View
5.16 mm5.18 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1558723449
Side View
Table 61.0%Crown 33°Girdle: Slightly ThickPavilion 41°Culet: NoneDepth 59.9%

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: Oct 28
Current: $1,293 AUD|Low: $674 AUD|High: $2,261 AUD|Avg: $1,356 AUD|+2.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 28, 2026
Retailer 7$674 AUD
Retailer 5$903 AUD
Retailer 4$1,254 AUD
Retailer 1$1,293 AUD
Retailer 2$1,426 AUD
Retailer 8$1,455 AUD
Retailer 3$1,477 AUD
Retailer 6$2,246 AUD

39 data points across 8 retailers

20 retailers$674 AUD to $2,779 AUD

A
Cheapest Retailer
-
$674 AUD
$474 USD
Final sale: no returns
A
Retailer 2
-
$876 AUD
$616 USD
View
Price last confirmed 59 days ago
A
Retailer 3
-
$903 AUD
$635 USD
View
A
Retailer 4
-
$903 AUD
$635 USD
View
Price last confirmed 7 days ago
A
Retailer 5
-
$913 AUD
$642 USD
View
Price last confirmed 8 days ago
B+
Retailer 6
-
$944 AUD
$664 USD
View
Price last confirmed 13 days ago
B+
Retailer 7
-
$944 AUD
$664 USD
View
Price last confirmed 13 days ago
B+
Retailer 8
-
$1,011 AUD
$711 USD
View
Price last confirmed 37 days ago
B+
Retailer 9
-
$1,034 AUD
$727 USD
View
Price last confirmed 11 days ago
B+
Retailer 10
-
$1,072 AUD
$754 USD
View
B+
Retailer 11
-
$1,158 AUD
$815 USD
View
B+
Retailer 12
-
$1,226 AUD
$862 USD
View
B+
Retailer 13
-
$1,254 AUD
£695 GBP
View
Price last confirmed 8 days ago
B
Retailer 14
-
$1,293 AUD
€866 EUR
View
B
Retailer 15
-
$1,426 AUD
£790 GBP
View
B
Retailer 16
-
$1,455 AUD
View
Price last confirmed 25 days ago
B
Retailer 17
-
$1,477 AUD
ZAR 16,776 ZAR
View
Price last confirmed 7 days ago
B
Retailer 18
-
$2,246 AUD
£1,244 GBP
View
Price last confirmed 8 days ago
B
Retailer 19
-
$2,779 AUD
CA$2,715 CAD
View
Most Expensive
B
NZ Jewellers
de064202-05b1-4c7f-86ba-6583191e01de · Oct 17
$3,034 AUD
$2,134 USD
View
Price last confirmed 12 days ago
19 more retailers have this diamond
Prices start from $674 AUDSave up to $2,105 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
$674 AUD