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Round|Natural|GIA

2.51ct K SI2 Round Natural Diamond

EX • K/SI2 • GIA 2556787346

Certificate GIA 2556787346

Diamond specifications and retailer prices

From $16,301 AUD
As of November 4, 2026
Save $12,570 AUD (44%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $28,871 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2556787346. Listed at 10 retailers as of November 4, 2026, with prices from $16,301 to $28,871, a $12,570 spread on the same certified stone. MOH London lists it at $28,871. 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 2556787346
Dimensions8.60 × 5.41 × 5.41 mm
L/W Ratio1.59
Culet sizeNone
Top View
8.60 mm5.41 mm2.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556787346
Side View
Table 56.0%Crown 36.5°Girdle: THN-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 4
Current: $28,871 AUD|Low: $15,568 AUD|High: $29,297 AUD|Avg: $19,739 AUD|-1.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 3$15,568 AUD
Retailer 5$16,301 AUD
Retailer 11$16,749 AUD
Retailer 9$17,199 AUD
Retailer 8$18,536 AUD
Retailer 2$19,450 AUD
Retailer 7$19,858 AUD
Retailer 10$20,080 AUD
Retailer 6$22,169 AUD
Retailer 4$22,289 AUD
MOH London$28,871 AUD

33 data points across 11 retailers

10 retailers$16,301 AUD to $28,871 AUD

A
Cheapest Retailer
-
$16,301 AUD
A
Retailer 2
-
$17,199 AUD
View
Retailer 3
-
$18,536 AUD
View
Price last confirmed 8 days ago
B+
Retailer 4
-
$19,289 AUD
View
B+
Retailer 5
-
$19,450 AUD
View
B+
Retailer 6
-
$19,858 AUD
View
B+
Retailer 7
-
$20,080 AUD
View
B+
Retailer 8
-
$22,169 AUD
View
B+
Retailer 9
-
$22,289 AUD
View
Most Expensive
B
MOH London
44FDDC741 · Nov 4
$28,871 AUD
£15,914 GBP
View
9 more retailers have this diamond
Prices start from $16,301 AUDSave up to $12,570 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
$16,301 AUD