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Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 7556598440

Certificate GIA 7556598440

Diamond specifications and retailer prices

From $869 NZD
$490 USD
As of November 2, 2026
Save $2,706 NZD (76%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $3,898 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 7556598440. Listed at 20 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 angle41°
OriginNatural
Grading LabGIA
CertificateGIA 7556598440
Dimensions5.07 × 5.10 × 3.16 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Cloud
Top View
5.07 mm5.10 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 7556598440
Side View
Table 59.0%Crown 36°Girdle: Slightly ThickPavilion 41°Culet: NoneDepth 62.1%

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: $1,608 NZD|Low: $869 NZD|High: $2,905 NZD|Avg: $1,758 NZD|-1.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 7$869 NZD
Retailer 5$1,455 NZD
Retailer 2$1,527 NZD
Retailer 1$1,608 NZD
Retailer 3$1,656 NZD
Retailer 8$1,869 NZD
Retailer 6$1,918 NZD
Retailer 4$2,871 NZD

39 data points across 8 retailers

20 retailers$869 NZD to $3,575 NZD

A
Cheapest Retailer
-
$869 NZD
$490 USD
Final sale: no returns
A
Retailer 2
-
$1,157 NZD
$652 USD
View
Retailer 3
-
$1,171 NZD
$660 USD
View
Price last confirmed 13 days ago
Retailer 4
-
$1,212 NZD
$683 USD
View
Price last confirmed 17 days ago
Retailer 5
-
$1,212 NZD
$683 USD
View
Price last confirmed 17 days ago
Retailer 6
-
$1,299 NZD
$732 USD
View
Price last confirmed 41 days ago
B+
Retailer 7
-
$1,321 NZD
$745 USD
View
B+
Retailer 8
-
$1,379 NZD
$777 USD
View
B+
Retailer 9
-
$1,455 NZD
$820 USD
View
B+
Retailer 10
-
$1,490 NZD
$840 USD
View
B
Retailer 11
-
$1,527 NZD
£678 GBP
View
B
Retailer 12
-
$1,576 NZD
$888 USD
View
B+
Retailer 13
-
$1,608 NZD
£714 GBP
View
B+
Retailer 14
-
$1,656 NZD
€889 EUR
View
B+
Retailer 15
-
$1,734 NZD
$977 USD
View
Retailer 16
-
$1,869 NZD
A$1,621 AUD
View
Price last confirmed 28 days ago
B
Retailer 17
-
$1,918 NZD
ZAR 17,467 ZAR
View
B
Retailer 18
-
$2,871 NZD
£1,274 GBP
View
B
Retailer 19
-
$3,575 NZD
CA$2,799 CAD
View
Most Expensive
NZ Jewellers
dd0a0fcd-78f4-4e8d-ba0f-67e1a70c174b · Oct 17
$3,898 NZD
$2,197 USD
View
Price last confirmed 16 days ago
19 more retailers have this diamond
Prices start from $869 NZDSave up to $2,706 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
$869 NZD