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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 $1,246 NZD
$701 USD
As of October 31, 2026
Save $301 NZD (19%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $1,546 NZD at Blue Nile · As of November 3, 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 $1,246 to $1,546, a $301 spread on the same certified stone. Blue Nile lists it at $1,546. 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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: $1,546 NZD|Low: $1,246 NZD|High: $1,546 NZD|Avg: $1,372 NZD
Blue Nile
Retailer 2
Retailer 3
September 26, 2026
Retailer 3$1,246 NZD
Retailer 2$1,411 NZD
Blue Nile$1,546 NZD

2 data points across 3 retailers

3 retailers$1,246 NZD to $1,546 NZD

B
Cheapest Retailer
-
$1,246 NZD
$701 USD
B
Retailer 2
-
$1,411 NZD
$794 USD
View
Most Expensive
B
Blue Nile
15398700 · Nov 3
$1,546 NZD
$870 USD
View
2 more retailers have this diamond
Prices start from $1,246 NZDSave up to $301 NZD

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
$1,246 NZD