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Round|Natural|GIA

2.51ct K SI1 Round Natural Diamond

GD • K/SI1 • GIA 6505344907

Certificate GIA 6505344907

Diamond specifications and retailer prices

From $19,820 AUD
As of November 1, 2026
Save $4,514 AUD (19%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $24,334 AUD at Blue Nile · As of November 5, 2026
View at Blue Nile

About this 2.51ct natural round diamond

This 2.51ct natural round sits in the two to three carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a standard cut grade and certified by GIA 6505344907. Listed at 2 retailers as of November 1, 2026, with prices from $19,820 to $24,334, a $4,514 spread on the same certified stone. Blue Nile lists it at $24,334. 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

2.51
Carat
K
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishGood
SymmetryGood
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6505344907
Dimensions8.65 × 8.61 × 5.39 mm
L/W Ratio1.00
Top View
8.65 mm8.61 mm2.51 ctK / SI1
OriginNatural
CutGood
PolishGood
SymmetryGood
FluorescenceFaint
CertificateGIA 6505344907
Side View
Table 58.0%CrownGirdle: ThickPavilionCulet: NoneDepth 62.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $24,334 AUD|Low: $19,820 AUD|High: $24,334 AUD|Avg: $22,088 AUD
Blue Nile
Retailer 2
October 18, 2026
Retailer 2$19,820 AUD
Blue Nile$24,334 AUD

4 data points across 2 retailers

2 retailers$19,820 AUD to $24,334 AUD

B+
Cheapest Retailer
-
$19,820 AUD
Most Expensive
C
Blue Nile
25308855 · Nov 5
$24,334 AUD
$17,035 USD
View
1 more retailer has this diamond
Prices start from $19,820 AUDSave up to $4,514 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+
2.51ct Round
$19,820 AUD