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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 $13,221 AUD
As of November 4, 2026
Save $11,732 AUD (47%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $24,953 AUD 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 $13,221 to $24,953, a $11,732 spread on the same certified stone. NZ Jewellers lists it at $24,953. 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: $24,953 AUD|Low: $12,477 AUD|High: $24,953 AUD|Avg: $18,163 AUD
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$13,221 AUD
Retailer 8$14,972 AUD
Retailer 10$14,972 AUD
Retailer 2$15,905 AUD
Retailer 12$16,219 AUD
Retailer 9$16,469 AUD
Retailer 5$17,941 AUD
Retailer 11$18,715 AUD
Retailer 3$19,696 AUD
Retailer 4$21,343 AUD
Retailer 6$23,319 AUD
NZ Jewellers$24,953 AUD

41 data points across 12 retailers

18 retailers$13,221 AUD to $24,953 AUD

B+
Cheapest Retailer
-
$13,221 AUD
B
Retailer 2
-
$13,634 AUD
View
B
Retailer 3
-
$13,891 AUD
View
B
Retailer 4
-
$14,308 AUD
View
Retailer 5
-
$14,972 AUD
View
Price last confirmed 8 days ago
B
Retailer 6
-
$14,972 AUD
View
Final sale: no returns
B
Retailer 7
-
$15,905 AUD
View
B
Retailer 8
-
$16,219 AUD
View
B
Retailer 9
-
$16,469 AUD
View
B
Retailer 10
-
$17,296 AUD
View
B
Retailer 11
-
$17,499 AUD
View
B
Retailer 12
-
$17,499 AUD
View
B
Retailer 13
-
$17,941 AUD
View
B
Retailer 14
-
$18,085 AUD
View
B
Retailer 15
-
$18,715 AUD
View
Retailer 16
-
$19,696 AUD
View
Price last confirmed 14 days ago
B
Retailer 17
-
$23,319 AUD
View
Most Expensive
B
NZ Jewellers
647ee53a-c6df-43c7-89e3-127918a6fd9a · Nov 5
$24,953 AUD
$17,468 USD
View
17 more retailers have this diamond
Prices start from $13,221 AUDSave up to $11,732 AUD

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
$13,221 AUD