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Radiant|Natural|GIA

1.51ct K SI1 Radiant Natural Diamond

VG • K/SI1 • GIA 6525056251

Certificate GIA 6525056251

Diamond specifications and retailer prices

From $4,027 AUD
As of November 4, 2026
Save $4,253 AUD (51%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $8,649 AUD at NZ Jewellers · As of October 24, 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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 6525056251. Listed at 18 retailers as of November 4, 2026, with a 106% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
K
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6525056251
Dimensions7.57 × 5.58 × 3.88 mm
L/W Ratio1.36
Top View
7.57 mm5.58 mm1.51 ctK / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6525056251
Side View
Table 67.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 69.5%

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 4
Current: $5,136 AUD|Low: $3,915 AUD|High: $8,402 AUD|Avg: $5,534 AUD|+0.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 7, 2026
Retailer 8$3,915 AUD
Retailer 6$4,529 AUD
Retailer 9$4,670 AUD
Retailer 2$4,816 AUD
Retailer 7$5,100 AUD
Retailer 1$5,136 AUD
Retailer 3$5,779 AUD
Retailer 4$6,059 AUD
Retailer 5$8,280 AUD

40 data points across 9 retailers

18 retailers$4,027 AUD to $8,280 AUD

Retailer 1
-
$3,915 AUD
Price last confirmed 17 days ago
A
Retailer 2
-
$4,027 AUD
View
A
Retailer 3
-
$4,031 AUD
View
A
Retailer 4
-
$4,224 AUD
View
Retailer 5
-
$4,497 AUD
View
Price last confirmed 12 days ago
Retailer 6
-
$4,497 AUD
View
Price last confirmed 13 days ago
B+
Retailer 7
-
$4,529 AUD
View
Retailer 8
-
$4,670 AUD
View
Price last confirmed 13 days ago
B+
Retailer 9
-
$4,727 AUD
View
A
Retailer 10
-
$4,816 AUD
View
B+
Retailer 11
-
$5,100 AUD
View
B+
Retailer 12
-
$5,136 AUD
View
Retailer 13
-
$5,190 AUD
View
Price last confirmed 15 days ago
Retailer 14
-
$5,627 AUD
View
Price last confirmed 15 days ago
B+
Retailer 15
-
$5,779 AUD
View
B+
Retailer 16
-
$6,059 AUD
View
B
Retailer 17
-
$8,280 AUD
View
Most Expensive
NZ Jewellers
b03f8a28-4be2-450e-9357-369d22c74ae1 · Oct 24
$8,649 AUD
$5,943 USD
View
Price last confirmed 13 days ago
17 more retailers have this diamond
Prices start from $4,027 AUDSave up to $4,253 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
$4,027 AUD