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Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1555696156

Certificate GIA 1555696156

Diamond specifications and retailer prices

From $675 AUD
$474 USD
As of November 2, 2026
Save $2,108 AUD (76%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $3,038 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 1555696156. Listed at 20 retailers as of October 30, 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 angle34°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 1555696156
Dimensions5.08 × 5.12 × 3.16 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Crystal, Cloud
Top View
5.08 mm5.12 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1555696156
Side View
Table 62.0%Crown 34°Girdle: MED-STKPavilion 41.8°Culet: NoneDepth 61.9%

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: Nov 2
Current: $1,291 AUD|Low: $675 AUD|High: $2,264 AUD|Avg: $1,356 AUD|+2.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 1, 2026
Retailer 7$675 AUD
Retailer 5$1,146 AUD
Retailer 4$1,189 AUD
Retailer 2$1,253 AUD
Retailer 1$1,291 AUD
Retailer 8$1,457 AUD
Retailer 6$1,495 AUD
Retailer 3$2,236 AUD

38 data points across 8 retailers

20 retailers$675 AUD to $2,782 AUD

A
Cheapest Retailer
-
$675 AUD
$474 USD
Final sale: no returns
Retailer 2
-
$877 AUD
$616 USD
View
Price last confirmed 63 days ago
A
Retailer 3
-
$904 AUD
$635 USD
View
Retailer 4
-
$914 AUD
$642 USD
View
Price last confirmed 12 days ago
Retailer 5
-
$945 AUD
$664 USD
View
Price last confirmed 17 days ago
Retailer 6
-
$945 AUD
$664 USD
View
Price last confirmed 17 days ago
Retailer 7
-
$1,012 AUD
$711 USD
View
Price last confirmed 41 days ago
B+
Retailer 8
-
$1,035 AUD
$727 USD
View
B+
Retailer 9
-
$1,073 AUD
$754 USD
View
B+
Retailer 10
-
$1,146 AUD
$805 USD
View
B+
Retailer 11
-
$1,160 AUD
$815 USD
View
B
Retailer 12
-
$1,189 AUD
£658 GBP
View
B+
Retailer 13
-
$1,227 AUD
$862 USD
View
B+
Retailer 14
-
$1,253 AUD
£693 GBP
View
B
Retailer 15
-
$1,291 AUD
€864 EUR
View
Retailer 16
-
$1,457 AUD
View
Price last confirmed 29 days ago
B
Retailer 17
-
$1,495 AUD
ZAR 16,968 ZAR
View
B
Retailer 18
-
$2,236 AUD
£1,237 GBP
View
B
Retailer 19
-
$2,782 AUD
CA$2,715 CAD
View
Most Expensive
NZ Jewellers
b1270695-e9fe-411b-97e9-dafa7daf9302 · Oct 17
$3,038 AUD
$2,134 USD
View
Price last confirmed 15 days ago
19 more retailers have this diamond
Prices start from $675 AUDSave up to $2,108 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
$675 AUD