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Radiant|Natural|GIA

1.51ct H SI2 Radiant Natural Diamond

EX • H/SI2 • GIA 6551278496

Certificate GIA 6551278496

Diamond specifications and retailer prices

From $5,517 AUD
As of November 2, 2026
Save $4,405 AUD (44%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $9,923 AUD at NZ Jewellers · As of November 3, 2026
View at NZ Jewellers

About this 1.51ct natural radiant diamond

This 1.51ct natural radiant sits in the one-and-a-half to two carat band, graded H colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551278496. Listed at 6 retailers as of November 2, 2026, with prices from $5,517 to $9,923, a $4,405 spread on the same certified stone. NZ Jewellers lists it at $9,923. 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
H
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle50.5°
Pavilion angle35.96°
OriginNatural
Grading LabGIA
CertificateGIA 6551278496
Dimensions7.63 × 5.69 × 3.93 mm
L/W Ratio1.34
Girdle conditionThick
Key to symbols
Crystal, Feather, Cloud
Top View
7.63 mm5.69 mm1.51 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551278496
Side View
Table 69.0%Crown 50.5°Girdle: ThickPavilion 35.96°Culet: NoneDepth 69.0%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: $9,923 AUD|Low: $5,277 AUD|High: $10,025 AUD|Avg: $6,816 AUD|-1.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 7$5,277 AUD
Retailer 2$5,517 AUD
Retailer 4$5,696 AUD
Retailer 6$5,696 AUD
Retailer 5$5,907 AUD
Retailer 8$6,292 AUD
Retailer 3$9,575 AUD
NZ Jewellers$9,923 AUD

30 data points across 8 retailers

6 retailers$5,517 AUD to $9,923 AUD

A
Cheapest Retailer
-
$5,517 AUD
A
Retailer 2
-
$5,696 AUD
View
A
Retailer 3
-
$5,696 AUD
View
A
Retailer 4
-
$5,907 AUD
View
Retailer 5
-
$9,575 AUD
View
Price last confirmed 9 days ago
Most Expensive
B+
NZ Jewellers
cc57a906-508e-483f-9f0b-71230cce7ed2 · Nov 3
$9,923 AUD
$6,818 USD
View
5 more retailers have this diamond
Prices start from $5,517 AUDSave up to $4,405 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.

A
1.51ct Radiant
$5,517 AUD