CaratHunter
Plans
Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 5556598199

Certificate GIA 5556598199

Diamond specifications and retailer prices

From $698 AUD
$490 USD
As of November 2, 2026
Save $2,171 AUD (76%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $3,128 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 5556598199. Listed at 19 retailers as of October 30, 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 angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 5556598199
Dimensions5.08 × 5.12 × 3.17 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Crystal
Top View
5.08 mm5.12 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5556598199
Side View
Table 59.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.2%

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 2
Current: $1,226 AUD|Low: $634 AUD|High: $2,330 AUD|Avg: $1,386 AUD|+6.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 6$698 AUD
Retailer 3$1,167 AUD
Retailer 1$1,226 AUD
Retailer 2$1,329 AUD
Retailer 8$1,391 AUD
Retailer 7$1,500 AUD
Retailer 4$1,539 AUD
Retailer 5$2,316 AUD

41 data points across 8 retailers

19 retailers$698 AUD to $2,869 AUD

A
Cheapest Retailer
-
$698 AUD
$490 USD
Final sale: no returns
A
Retailer 2
-
$928 AUD
$652 USD
View
Retailer 3
-
$940 AUD
$660 USD
View
Price last confirmed 13 days ago
Retailer 4
-
$972 AUD
$683 USD
View
Price last confirmed 17 days ago
Retailer 5
-
$972 AUD
$683 USD
View
Price last confirmed 17 days ago
Retailer 6
-
$1,042 AUD
$732 USD
View
Price last confirmed 41 days ago
B+
Retailer 7
-
$1,060 AUD
$745 USD
View
B+
Retailer 8
-
$1,106 AUD
$777 USD
View
B+
Retailer 9
-
$1,167 AUD
$820 USD
View
B+
Retailer 10
-
$1,195 AUD
$840 USD
View
B
Retailer 11
-
$1,226 AUD
£678 GBP
View
B
Retailer 12
-
$1,264 AUD
$888 USD
View
B+
Retailer 13
-
$1,329 AUD
€889 EUR
View
B+
Retailer 14
-
$1,391 AUD
$977 USD
View
Retailer 15
-
$1,500 AUD
View
Price last confirmed 28 days ago
B
Retailer 16
-
$1,539 AUD
ZAR 17,467 ZAR
View
Retailer 17
-
$2,316 AUD
£1,281 GBP
View
Price last confirmed 12 days ago
B
Retailer 18
-
$2,869 AUD
CA$2,799 CAD
View
Most Expensive
NZ Jewellers
73cd0e3b-7c4d-4c16-b8db-b395cd03d181 · Oct 17
$3,128 AUD
$2,197 USD
View
Price last confirmed 15 days ago
18 more retailers have this diamond
Prices start from $698 AUDSave up to $2,171 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
$698 AUD