Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2556603477

Certificate GIA 2556603477

Diamond specifications and retailer prices

From $728 AUD
$512 USD
As of October 28, 2026
Save $2,265 AUD (76%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $3,258 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 2556603477. Listed at 20 retailers as of October 27, 2026, with a 311% 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 angle34.5°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 2556603477
Dimensions5.06 × 5.10 × 3.16 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Cloud
Top View
5.06 mm5.10 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556603477
Side View
Table 61.0%Crown 34.5°Girdle: Slightly ThickPavilion 41.6°Culet: NoneDepth 62.3%

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: $1,347 AUD|Low: $661 AUD|High: $1,925 AUD|Avg: $1,345 AUD|+3.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 28, 2026
Retailer 6$728 AUD
Retailer 5$1,202 AUD
Retailer 9$1,320 AUD
Retailer 1$1,347 AUD
Retailer 2$1,422 AUD
Retailer 8$1,452 AUD
Retailer 7$1,562 AUD
Retailer 3$1,585 AUD
Retailer 4$1,912 AUD

40 data points across 9 retailers

20 retailers$728 AUD to $2,993 AUD

A
Cheapest Retailer
-
$728 AUD
$512 USD
Final sale: no returns
A
Retailer 2
-
$924 AUD
$650 USD
View
Price last confirmed 8 days ago
B+
Retailer 3
-
$941 AUD
$662 USD
View
Price last confirmed 13 days ago
B+
Retailer 4
-
$941 AUD
$662 USD
View
Price last confirmed 59 days ago
B+
Retailer 5
-
$964 AUD
$678 USD
View
B+
Retailer 6
-
$977 AUD
$687 USD
View
Price last confirmed 13 days ago
B+
Retailer 7
-
$1,086 AUD
$764 USD
View
Price last confirmed 37 days ago
B+
Retailer 8
-
$1,096 AUD
$771 USD
View
Price last confirmed 11 days ago
B+
Retailer 9
-
$1,155 AUD
$812 USD
View
B
Retailer 10
-
$1,202 AUD
$845 USD
View
Price last confirmed 7 days ago
B
Retailer 11
-
$1,247 AUD
$877 USD
View
B
Retailer 12
-
$1,320 AUD
$928 USD
View
B+
Retailer 13
-
$1,347 AUD
€902 EUR
View
B
Retailer 14
-
$1,422 AUD
£788 GBP
View
B
Retailer 15
-
$1,452 AUD
$1,021 USD
View
B
Retailer 16
-
$1,562 AUD
View
Price last confirmed 25 days ago
B
Retailer 17
-
$1,585 AUD
ZAR 18,011 ZAR
View
Price last confirmed 7 days ago
B
Retailer 18
-
$1,912 AUD
£1,059 GBP
View
Price last confirmed 8 days ago
B
Retailer 19
-
$2,993 AUD
CA$2,923 CAD
View
Most Expensive
B
NZ Jewellers
9d058924-124d-4d64-be57-fd7bf0c3d098 · Oct 17
$3,258 AUD
$2,291 USD
View
Price under review
19 more retailers have this diamond
Prices start from $728 AUDSave up to $2,265 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
$728 AUD