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Round|Natural|GIA

1.51ct D SI2 Round Natural Diamond

EX • D/SI2 • GIA 6511657389

Certificate GIA 6511657389

Diamond specifications and retailer prices

From $8,255 AUD
HK$45,300 HKD
As of October 31, 2026
Save $7,308 AUD (47%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $19,058 AUD at NZ Jewellers · As of September 25, 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 6511657389. Listed at 14 retailers as of October 29, 2026, with a 89% 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
FluorescenceFaint
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6511657389
Dimensions7.32 × 7.28 × 4.51 mm
L/W Ratio1.01
Top View
7.32 mm7.28 mm1.51 ctD / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6511657389
Side View
Table 59.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.0%

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: Oct 31
Current: $9,768 AUD|Low: $8,036 AUD|High: $16,071 AUD|Avg: $10,226 AUD|-7.9%
Retailer 1
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
November 1, 2026
Retailer 2$8,186 AUD
Retailer 8$8,255 AUD
Retailer 9$8,475 AUD
Retailer 11$8,821 AUD
Retailer 7$9,141 AUD
Retailer 13$9,179 AUD
Retailer 14$9,670 AUD
Retailer 1$9,768 AUD
Retailer 12$9,937 AUD
Retailer 3$10,733 AUD
Retailer 6$10,880 AUD
Retailer 5$11,610 AUD
Retailer 4$11,858 AUD
Retailer 10$15,563 AUD

38 data points across 14 retailers

14 retailers$8,255 AUD to $15,563 AUD

Retailer 1
-
$8,186 AUD
$5,750 USD
Price last confirmed 10 days ago
A
Retailer 2
-
$8,255 AUD
HK$45,300 HKD
View
A
Retailer 3
-
$8,475 AUD
$5,953 USD
View
A
Retailer 4
-
$8,821 AUD
$6,196 USD
View
A
Retailer 5
-
$9,141 AUD
$6,421 USD
View
Final sale: no returns
A
Retailer 6
-
$9,179 AUD
$6,448 USD
View
A
Retailer 7
-
$9,670 AUD
$6,793 USD
View
A
Retailer 8
-
$9,768 AUD
£5,403 GBP
View
A
Retailer 9
-
$9,937 AUD
$6,980 USD
View
A
Retailer 10
-
$10,733 AUD
SGD 10,188 SGD
View
A
Retailer 11
-
$10,880 AUD
View
Retailer 12
-
$11,610 AUD
$8,155 USD
View
Price last confirmed 8 days ago
B+
Retailer 13
-
$15,563 AUD
£8,608 GBP
View
Most Expensive
NZ Jewellers
67d7e602-8786-4201-9a30-7eff39b7dc82 · Sep 25
$19,058 AUD
$13,387 USD
View
Price last confirmed 36 days ago
13 more retailers have this diamond
Prices start from $8,255 AUDSave up to $7,308 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
$8,255 AUD