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Round|Natural|GIA

2.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 1545386388

Certificate GIA 1545386388

Diamond specifications and retailer prices

From $21,090 AUD
$14,764 USD
As of November 5, 2026
2 retailers carry this diamond
Most expensive: $21,090 AUD at Blue Nile
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 top-tier cut grade and certified by GIA 1545386388. Listed at 2 retailers as of November 5, 2026. 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

2.51
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1545386388
Dimensions8.64 × 8.60 × 5.42 mm
L/W Ratio1.00
Top View
8.64 mm8.60 mm2.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1545386388
Side View
Table 58.0%CrownGirdle: Sli. ThickPavilionCulet: NDepth 62.9%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 5
Current: $21,090 AUD|Low: $14,335 AUD|High: $22,139 AUD|Avg: $18,041 AUD
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 12, 2026
Retailer 11$14,335 AUD
Retailer 7$14,826 AUD
Retailer 9$16,156 AUD
Retailer 4$16,552 AUD
Retailer 8$17,098 AUD
Retailer 3$17,799 AUD
Retailer 6$18,053 AUD
Retailer 2$19,206 AUD
Retailer 5$20,040 AUD
Retailer 12$20,596 AUD
Blue Nile$21,090 AUD
Retailer 10$22,139 AUD

3 data points across 12 retailers

2 retailers

Retailer 1
-
$19,206 AUD
Price last confirmed 21 days ago
Most Expensive
B+
Blue Nile
29711795 · Nov 5
$21,090 AUD
$14,764 USD
View
1 more retailer has this diamond

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
$21,090 AUD