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Round|Natural|GIA

2.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6525293492

Certificate GIA 6525293492

Diamond specifications and retailer prices

From $17,863 AUD
As of November 1, 2026
Save $12,773 AUD (42%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $30,636 AUD at MOH London · As of November 4, 2026
View at MOH London

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 6525293492. Listed at 15 retailers as of November 1, 2026, with prices from $17,863 to $30,636, a $12,773 spread on the same certified stone. MOH London lists it at $30,636. 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
FluorescenceMedium
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6525293492
Dimensions8.67 × 8.62 × 5.41 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
8.67 mm8.62 mm2.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 6525293492
Side View
Table 55.0%Crown 36°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.6%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $30,636 AUD|Low: $17,863 AUD|High: $31,088 AUD|Avg: $23,056 AUD|-1.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 6$17,863 AUD
Retailer 7$18,248 AUD
Retailer 4$20,650 AUD
Retailer 8$21,413 AUD
Retailer 2$22,507 AUD
Retailer 5$24,590 AUD
Retailer 3$27,007 AUD
MOH London$30,636 AUD

36 data points across 8 retailers

15 retailers$17,863 AUD to $30,636 AUD

A
Cheapest Retailer
-
$17,863 AUD
A
Retailer 2
-
$18,248 AUD
View
B+
Retailer 3
-
$19,320 AUD
View
Retailer 4
-
$19,669 AUD
View
Price last confirmed 8 days ago
B+
Retailer 5
-
$20,650 AUD
View
B+
Retailer 6
-
$20,980 AUD
View
B+
Retailer 7
-
$21,308 AUD
View
B+
Retailer 8
-
$21,413 AUD
View
B+
Retailer 9
-
$21,503 AUD
View
B+
Retailer 10
-
$22,127 AUD
View
B+
Retailer 11
-
$22,507 AUD
View
B
Retailer 12
-
$24,590 AUD
View
B
Retailer 13
-
$27,007 AUD
View
B
Retailer 14
-
$27,864 AUD
View
Most Expensive
B
MOH London
C28A85AE2 · Nov 4
$30,636 AUD
£16,887 GBP
View
14 more retailers have this diamond
Prices start from $17,863 AUDSave up to $12,773 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.

A
2.51ct Round
$17,863 AUD