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Round|Natural|GIA

1.51ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 6421142723

Certificate GIA 6421142723

Diamond specifications and retailer prices

From $16,695 NZD
As of November 4, 2026
Save $14,815 NZD (47%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $31,511 NZD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

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 6421142723. Listed at 18 retailers as of November 4, 2026, with prices from $16,695 to $31,511, a $14,815 spread on the same certified stone. NZ Jewellers lists it at $31,511. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6421142723
Dimensions7.45 × 7.43 × 4.49 mm
L/W Ratio1.00
Top View
7.45 mm7.43 mm1.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6421142723
Side View
Table 59.0%CrownGirdle: MediumPavilionCulet: NoneDepth 60.4%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $31,511 NZD|Low: $15,755 NZD|High: $31,511 NZD|Avg: $22,936 NZD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 7$16,695 NZD
Retailer 8$18,907 NZD
Retailer 10$18,907 NZD
Retailer 2$20,085 NZD
Retailer 12$20,481 NZD
Retailer 9$20,797 NZD
Retailer 5$22,655 NZD
Retailer 11$23,633 NZD
Retailer 3$24,872 NZD
Retailer 4$26,952 NZD
Retailer 6$29,447 NZD
NZ Jewellers$31,511 NZD

41 data points across 12 retailers

18 retailers$16,695 NZD to $31,511 NZD

B+
Cheapest Retailer
-
$16,695 NZD
B
Retailer 2
-
$17,216 NZD
View
B
Retailer 3
-
$17,541 NZD
View
B
Retailer 4
-
$18,068 NZD
View
Retailer 5
-
$18,907 NZD
View
Price last confirmed 8 days ago
B
Retailer 6
-
$18,907 NZD
View
Final sale: no returns
B
Retailer 7
-
$20,085 NZD
View
B
Retailer 8
-
$20,481 NZD
View
B
Retailer 9
-
$20,797 NZD
View
B
Retailer 10
-
$21,842 NZD
View
B
Retailer 11
-
$22,098 NZD
View
B
Retailer 12
-
$22,098 NZD
View
B
Retailer 13
-
$22,655 NZD
View
B
Retailer 14
-
$22,837 NZD
View
B
Retailer 15
-
$23,633 NZD
View
Retailer 16
-
$24,872 NZD
View
Price last confirmed 14 days ago
B
Retailer 17
-
$29,447 NZD
View
Most Expensive
B
NZ Jewellers
647ee53a-c6df-43c7-89e3-127918a6fd9a · Nov 5
$31,511 NZD
$17,468 USD
View
17 more retailers have this diamond
Prices start from $16,695 NZDSave up to $14,815 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.

B+
1.51ct Round
$16,695 NZD