CaratHunter
Plans
Round|Natural|GIA

1.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2566495423

Certificate GIA 2566495423

Diamond specifications and retailer prices

From $6,688 AUD
As of November 1, 2026
Save $6,453 AUD (49%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $14,921 AUD at NZ Jewellers · As of October 30, 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2566495423. Listed at 18 retailers as of November 1, 2026, with a 96% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 2566495423
Dimensions7.33 × 7.37 × 4.55 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Pinpoint, Indented Natural
Top View
7.33 mm7.37 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2566495423
Side View
Table 57.0%Crown 35°Girdle: MED-STKPavilion 41°Culet: NoneDepth 61.8%

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 1
Current: $14,921 AUD|Low: $6,631 AUD|High: $14,921 AUD|Avg: $9,342 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
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
November 2, 2026
Retailer 17$6,688 AUD
Retailer 13$7,092 AUD
Retailer 9$7,629 AUD
Retailer 8$7,821 AUD
Retailer 14$7,823 AUD
Retailer 11$8,501 AUD
Retailer 5$8,920 AUD
Retailer 6$8,920 AUD
Retailer 10$8,920 AUD
Retailer 3$9,060 AUD
Retailer 7$9,149 AUD
Retailer 2$9,173 AUD
Retailer 18$9,332 AUD
Retailer 12$9,705 AUD
Retailer 4$10,293 AUD
Retailer 16$10,959 AUD
Retailer 15$13,141 AUD
NZ Jewellers$14,921 AUD

11 data points across 18 retailers

18 retailers$6,688 AUD to $13,141 AUD

A
Cheapest Retailer
-
$6,688 AUD
A
Retailer 2
-
$7,092 AUD
View
Retailer 3
-
$7,629 AUD
View
Price last confirmed 10 days ago
A
Retailer 4
-
$7,821 AUD
View
A
Retailer 5
-
$7,823 AUD
View
B+
Retailer 6
-
$8,501 AUD
View
Retailer 7
-
$8,920 AUD
View
Price last confirmed 8 days ago
Retailer 8
-
$8,920 AUD
View
Price last confirmed 8 days ago
B+
Retailer 9
-
$8,920 AUD
View
B+
Retailer 10
-
$9,060 AUD
View
B+
Retailer 11
-
$9,149 AUD
View
B+
Retailer 12
-
$9,173 AUD
View
B+
Retailer 13
-
$9,332 AUD
View
B+
Retailer 14
-
$9,705 AUD
View
B+
Retailer 15
-
$10,293 AUD
View
B
Retailer 16
-
$10,959 AUD
View
B
Retailer 17
-
$13,141 AUD
View
Most Expensive
NZ Jewellers
ff341407-2ec3-4de4-9297-4dde2b7d59ee · Oct 30
$14,921 AUD
$10,252 USD
View
Price last confirmed 7 days ago
17 more retailers have this diamond
Prices start from $6,688 AUDSave up to $6,453 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 Round
$6,688 AUD