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Round|Natural|GIA

1.51ct G SI1 Round Natural Diamond

ID • G/SI1 • GIA 294

Certificate GIA 294

Diamond specifications and retailer prices

From $8,380 AUD
As of November 4, 2026
Save $15,739 AUD (65%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $24,119 AUD at Blue Nile · As of November 5, 2026
View at Blue Nile

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at 5 retailers as of November 4, 2026, with prices from $8,380 to $24,119, a $15,739 spread on the same certified stone. Blue Nile lists it at $24,119. 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
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 294
Dimensions7.31 × 7.35 × 4.58 mm
L/W Ratio1.01
Top View
7.31 mm7.35 mm1.51 ctG / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 294
Side View
Table 58.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 62.4%

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 4
Current: $10,042 AUD|Low: $8,380 AUD|High: $19,334 AUD|Avg: $12,971 AUD|-16.6%
Blue Nile
Retailer 2
Retailer 3
November 4, 2026
Retailer 2$8,380 AUD
Blue Nile$10,042 AUD
Retailer 3$19,334 AUD

12 data points across 3 retailers

5 retailers$8,380 AUD to $24,119 AUD

A
Cheapest Retailer
-
$8,380 AUD
A
Retailer 2
-
$10,042 AUD
View
B
Retailer 3
-
$19,334 AUD
View
B
Retailer 4
-
$20,811 AUD
View
Most Expensive
B
Blue Nile
121719 · Nov 5
$24,119 AUD
$16,572 USD
View
4 more retailers have this diamond
Prices start from $8,380 AUDSave up to $15,739 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
$8,380 AUD