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Round|Natural|GIA

2.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 1508712553

Certificate GIA 1508712553

Diamond specifications and retailer prices

From $18,782 AUD
As of November 6, 2026
Save $6,901 AUD (27%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $25,683 AUD at Wholesale Diamonds Direct · As of November 4, 2026
View at Wholesale Diamonds Direct

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 1508712553. Listed at 7 retailers as of November 4, 2026, with prices from $18,782 to $25,683, a $6,901 spread on the same certified stone. Wholesale Diamonds Direct lists it at $25,683. 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
Crown angle32°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 1508712553
Dimensions8.89 × 8.94 × 5.25 mm
L/W Ratio1.01
Star length55%
Lower girdle75%
Key to symbols
Feather, Crystal, Cloud, Needle
Top View
8.89 mm8.94 mm2.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1508712553
Side View
Table 60.0%Crown 32°Girdle: ThinPavilion 41.2°Culet: NoneDepth 58.9%

Caratlytics Score

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

Price History

Last verified: Nov 6
Current: $23,922 AUD|Low: $18,782 AUD|High: $25,062 AUD|Avg: $21,966 AUD|-0.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
November 6, 2026
Retailer 4$18,782 AUD
Retailer 3$20,085 AUD
Retailer 1$23,922 AUD
Retailer 2$24,753 AUD

43 data points across 4 retailers

7 retailers$18,782 AUD to $25,683 AUD

A
Cheapest Retailer
-
$18,782 AUD
B+
Retailer 2
-
$19,606 AUD
View
B+
Retailer 3
-
$22,833 AUD
View
B+
Retailer 4
-
$23,922 AUD
View
B
Retailer 5
-
$24,753 AUD
View
B
Retailer 6
-
$24,893 AUD
View
Most Expensive
B
Wholesale Diamonds Direct
129312743 · Nov 4
$25,683 AUD
$17,979 USD
View
6 more retailers have this diamond
Prices start from $18,782 AUDSave up to $6,901 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
$18,782 AUD