CaratHunter
Plans
Round|Natural|GIA

1.51ct I SI2 Round Natural Diamond

ID • I/SI2 • GIA 225

Certificate GIA 225

Diamond specifications and retailer prices

From $4,429 NZD
As of October 31, 2026
Save $7,537 NZD (63%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $11,967 NZD at Blue Nile · As of November 5, 2026
View at Blue Nile

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at 9 retailers as of October 31, 2026, with prices from $4,429 to $11,967, a $7,537 spread on the same certified stone. Blue Nile lists it at $11,967. 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

1.51
Carat
I
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 225
Dimensions7.27 × 7.32 × 4.58 mm
L/W Ratio1.01
Top View
7.27 mm7.32 mm1.51 ctI / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 225
Side View
Table 56.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 62.7%

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: Oct 31
Current: $11,967 NZD|Low: $4,429 NZD|High: $11,967 NZD|Avg: $8,649 NZD
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 5, 2026
Retailer 6$4,429 NZD
Retailer 3$5,703 NZD
Retailer 4$5,922 NZD
Retailer 5$6,580 NZD
Retailer 7$9,341 NZD
Retailer 2$9,935 NZD
Blue Nile$11,967 NZD

12 data points across 7 retailers

9 retailers$4,429 NZD to $11,967 NZD

A
Cheapest Retailer
-
$4,429 NZD
A
Retailer 2
-
$5,703 NZD
View
A
Retailer 3
-
$5,922 NZD
View
A
Retailer 4
-
$6,580 NZD
View
B+
Retailer 5
-
$9,341 NZD
View
Retailer 6
-
$9,894 NZD
View
Price last confirmed 60 days ago
B+
Retailer 7
-
$9,935 NZD
View
B+
Retailer 8
-
$10,179 NZD
View
Most Expensive
B+
Blue Nile
29189376 · Nov 5
$11,967 NZD
$6,727 USD
View
8 more retailers have this diamond
Prices start from $4,429 NZDSave up to $7,537 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
1.51ct Round
$4,429 NZD