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Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2556603477

Certificate GIA 2556603477

Diamond specifications and retailer prices

From $908 NZD
$512 USD
As of November 2, 2026
Save $2,826 NZD (76%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $4,065 NZD 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 21 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 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: Nov 2
Current: $1,677 NZD|Low: $825 NZD|High: $2,402 NZD|Avg: $1,697 NZD|-0.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 7$908 NZD
Retailer 6$1,499 NZD
Retailer 2$1,547 NZD
Retailer 3$1,677 NZD
Retailer 1$1,677 NZD
Retailer 9$1,812 NZD
Retailer 8$1,949 NZD
Retailer 5$2,001 NZD
Retailer 4$2,375 NZD

42 data points across 9 retailers

21 retailers$908 NZD to $3,734 NZD

A
Cheapest Retailer
-
$908 NZD
$512 USD
Final sale: no returns
Retailer 2
-
$1,153 NZD
$650 USD
View
Price last confirmed 12 days ago
Retailer 3
-
$1,175 NZD
$662 USD
View
Price last confirmed 17 days ago
Retailer 4
-
$1,175 NZD
$662 USD
View
Price last confirmed 63 days ago
B+
Retailer 5
-
$1,203 NZD
$678 USD
View
Retailer 6
-
$1,219 NZD
$687 USD
View
Retailer 7
-
$1,356 NZD
$764 USD
View
Price last confirmed 41 days ago
B+
Retailer 8
-
$1,368 NZD
$771 USD
View
B+
Retailer 9
-
$1,441 NZD
$812 USD
View
B
Retailer 10
-
$1,499 NZD
$845 USD
View
B
Retailer 11
-
$1,547 NZD
£687 GBP
View
B
Retailer 12
-
$1,556 NZD
$877 USD
View
B+
Retailer 13
-
$1,647 NZD
$928 USD
View
B+
Retailer 14
-
$1,677 NZD
€900 EUR
View
B+
Retailer 15
-
$1,677 NZD
£744 GBP
View
B
Retailer 16
-
$1,812 NZD
$1,021 USD
View
Retailer 17
-
$1,949 NZD
A$1,690 AUD
View
Price last confirmed 29 days ago
B
Retailer 18
-
$2,001 NZD
ZAR 18,217 ZAR
View
B
Retailer 19
-
$2,375 NZD
£1,054 GBP
View
B
Retailer 20
-
$3,734 NZD
CA$2,923 CAD
View
Most Expensive
NZ Jewellers
9d058924-124d-4d64-be57-fd7bf0c3d098 · Oct 17
$4,065 NZD
$2,291 USD
View
Price under review
20 more retailers have this diamond
Prices start from $908 NZDSave up to $2,826 NZD

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
$908 NZD