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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 $842 NZD
$474 USD
As of November 2, 2026
Save $2,631 NZD (76%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $3,793 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 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: $1,565 NZD|Low: $842 NZD|High: $2,826 NZD|Avg: $1,693 NZD|-1.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 7$842 NZD
Retailer 5$1,431 NZD
Retailer 2$1,485 NZD
Retailer 1$1,565 NZD
Retailer 3$1,612 NZD
Retailer 8$1,819 NZD
Retailer 6$1,867 NZD
Retailer 4$2,792 NZD

38 data points across 8 retailers

20 retailers$842 NZD to $3,474 NZD

A
Cheapest Retailer
-
$842 NZD
$474 USD
Final sale: no returns
Retailer 2
-
$1,095 NZD
$616 USD
View
Price last confirmed 63 days ago
A
Retailer 3
-
$1,129 NZD
$635 USD
View
Retailer 4
-
$1,141 NZD
$642 USD
View
Price last confirmed 13 days ago
Retailer 5
-
$1,180 NZD
$664 USD
View
Price last confirmed 17 days ago
B+
Retailer 6
-
$1,180 NZD
$664 USD
View
Retailer 7
-
$1,264 NZD
$711 USD
View
Price last confirmed 41 days ago
B+
Retailer 8
-
$1,293 NZD
$727 USD
View
B+
Retailer 9
-
$1,340 NZD
$754 USD
View
B+
Retailer 10
-
$1,431 NZD
$805 USD
View
B+
Retailer 11
-
$1,448 NZD
$815 USD
View
B
Retailer 12
-
$1,485 NZD
£658 GBP
View
B+
Retailer 13
-
$1,532 NZD
$862 USD
View
B+
Retailer 14
-
$1,565 NZD
£693 GBP
View
B
Retailer 15
-
$1,612 NZD
€864 EUR
View
Retailer 16
-
$1,819 NZD
A$1,574 AUD
View
Price last confirmed 29 days ago
B
Retailer 17
-
$1,867 NZD
ZAR 16,968 ZAR
View
B
Retailer 18
-
$2,792 NZD
£1,237 GBP
View
B
Retailer 19
-
$3,474 NZD
CA$2,715 CAD
View
Most Expensive
NZ Jewellers
b1270695-e9fe-411b-97e9-dafa7daf9302 · Oct 17
$3,793 NZD
$2,134 USD
View
Price last confirmed 16 days ago
19 more retailers have this diamond
Prices start from $842 NZDSave up to $2,631 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
$842 NZD