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Round|Natural|GIA

1.51ct D SI2 Round Natural Diamond

EX • D/SI2 • GIA 1515513768

Certificate GIA 1515513768

Diamond specifications and retailer prices

From $10,257 AUD
As of November 1, 2026
Save $6,500 AUD (39%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $20,165 AUD at NZ Jewellers · As of September 26, 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 D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1515513768. Listed at 14 retailers as of November 1, 2026, with a 63% 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
D
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1515513768
Dimensions7.46 × 7.41 × 4.49 mm
L/W Ratio1.01
Star length55%
Lower girdle75%
Key to symbols
Crystal, Needle
Top View
7.46 mm7.41 mm1.51 ctD / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1515513768
Side View
Table 59.0%Crown 33°Girdle: MED-STKPavilion 41°Culet: NoneDepth 60.5%

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 1
Current: $11,194 AUD|Low: $9,105 AUD|High: $17,003 AUD|Avg: $11,658 AUD|-2.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 5, 2026
Retailer 8$9,134 AUD
Retailer 9$10,257 AUD
Retailer 2$10,421 AUD
Retailer 10$11,128 AUD
Retailer 7$11,129 AUD
Retailer 1$11,194 AUD
Retailer 6$12,242 AUD
Retailer 4$12,375 AUD
Retailer 5$13,121 AUD
Retailer 3$16,756 AUD

35 data points across 10 retailers

14 retailers$10,257 AUD to $16,756 AUD

Retailer 1
-
$9,134 AUD
Price last confirmed 14 days ago
Retailer 2
-
$9,557 AUD
View
Price last confirmed 14 days ago
A
Retailer 3
-
$10,257 AUD
View
A
Retailer 4
-
$10,421 AUD
View
B+
Retailer 5
-
$11,128 AUD
View
Final sale: no returns
Retailer 6
-
$11,129 AUD
View
Price last confirmed 12 days ago
A
Retailer 7
-
$11,194 AUD
View
Retailer 8
-
$12,057 AUD
View
Price last confirmed 43 days ago
B+
Retailer 9
-
$12,242 AUD
View
B+
Retailer 10
-
$12,315 AUD
View
B+
Retailer 11
-
$12,375 AUD
View
B+
Retailer 12
-
$13,121 AUD
View
B+
Retailer 13
-
$16,756 AUD
View
Most Expensive
NZ Jewellers
85fadae0-54e4-4486-b836-b4c51b766ad7 · Sep 26
$20,165 AUD
$14,116 USD
View
Price last confirmed 40 days ago
13 more retailers have this diamond
Prices start from $10,257 AUDSave up to $6,500 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
$10,257 AUD