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Radiant|Natural|GIA

0.51ct H SI1 Radiant Natural Diamond

GD • H/SI1 • GIA 15

Certificate GIA 15

Diamond specifications and retailer prices

From $1,246 AUD
$873 USD
As of October 31, 2026
Save $97 AUD (7%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $1,343 AUD at B2C Jewels · As of November 2, 2026
View at B2C Jewels

About this 0.51ct natural radiant diamond

This 0.51ct natural radiant sits in the half to three-quarter carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA. Listed at 2 retailers as of October 31, 2026, with a relatively tight 8% spread, which is unusual at this carat range and suggests competitive pricing across the listings. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
H
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishVery Good
SymmetryGood
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 15
Dimensions4.93 × 3.96 × 2.96 mm
L/W Ratio1.24
Top View
4.93 mm3.96 mm0.51 ctH / SI1
OriginNatural
CutGood
PolishVery Good
SymmetryGood
FluorescenceFaint
CertificateGIA 15
Side View
Table 76.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 74.8%

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: $1,343 AUD|Low: $1,246 AUD|High: $3,621 AUD|Avg: $1,794 AUD|+1.4%
B2C Jewels
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
September 29, 2026
Retailer 6$1,246 AUD
B2C Jewels$1,343 AUD
Retailer 4$1,346 AUD
Retailer 2$1,397 AUD
Retailer 5$1,552 AUD
Retailer 3$3,621 AUD

3 data points across 6 retailers

2 retailers$1,246 AUD to $1,343 AUD

B
Cheapest Retailer
-
$1,246 AUD
$873 USD
Most Expensive
B
B2C Jewels
25204600 · Nov 2
$1,343 AUD
$941 USD
View
1 more retailer has this diamond
Prices start from $1,246 AUDSave up to $97 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
$1,246 AUD