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Radiant|Natural|GIA

0.51ct J SI1 Radiant Natural Diamond

ID • J/SI1 • GIA 11

Certificate GIA 11

Diamond specifications and retailer prices

From $1,000 AUD
$701 USD
As of October 31, 2026
Save $241 AUD (19%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $1,241 AUD at Blue Nile · As of October 31, 2026
View at Blue Nile

About this 0.51ct natural radiant diamond

This 0.51ct natural radiant sits in the half to three-quarter carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA. Listed at 3 retailers as of October 31, 2026, with prices from $1,000 to $1,241, a $241 spread on the same certified stone. Blue Nile lists it at $1,241. 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

0.51
Carat
J
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 11
Dimensions5.47 × 3.84 × 2.60 mm
L/W Ratio1.42
Top View
5.47 mm3.84 mm0.51 ctJ / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 11
Side View
Table 64.0%CrownGirdle: VTK-ETKPavilionCulet: NoneDepth 67.7%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 31
Current: $1,241 AUD|Low: $1,000 AUD|High: $1,241 AUD|Avg: $1,101 AUD
Blue Nile
Retailer 2
Retailer 3
September 26, 2026
Retailer 3$1,000 AUD
Retailer 2$1,133 AUD
Blue Nile$1,241 AUD

2 data points across 3 retailers

3 retailers$1,000 AUD to $1,241 AUD

B
Cheapest Retailer
-
$1,000 AUD
$701 USD
B
Retailer 2
-
$1,133 AUD
$794 USD
View
Most Expensive
B
Blue Nile
15398700 · Oct 31
$1,241 AUD
$870 USD
View
2 more retailers have this diamond
Prices start from $1,000 AUDSave up to $241 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.

B
0.51ct Radiant
$1,000 AUD