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Round|Natural|GIA

2.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2557787831

Certificate GIA 2557787831

Diamond specifications and retailer prices

From $10,598 USD
As of November 5, 2026
Save $9,703 USD (48%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $20,301 USD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

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 2557787831. Listed at 15 retailers as of November 5, 2026, with prices from $10,598 to $20,301, a $9,703 spread on the same certified stone. NZ Jewellers lists it at $20,301. 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
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2557787831
Dimensions8.60 × 8.64 × 5.40 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Needle
Top View
8.60 mm8.64 mm2.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557787831
Side View
Table 58.0%Crown 36°Girdle: Slightly ThickPavilion 40.8°Culet: NoneDepth 62.7%

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 5
Current: $13,939 USD|Low: $10,598 USD|High: $19,227 USD|Avg: $14,510 USD|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 4$10,598 USD
Retailer 5$12,782 USD
Retailer 1$13,939 USD
Retailer 7$14,342 USD
Retailer 8$14,566 USD
Retailer 3$14,627 USD
Retailer 2$16,726 USD
Retailer 6$18,972 USD

29 data points across 8 retailers

15 retailers$10,598 USD to $20,301 USD

A
Cheapest Retailer
-
$10,598 USD
A
Retailer 2
-
$12,325 USD
View
A
Retailer 3
-
$12,474 USD
View
A
Retailer 4
-
$12,747 USD
View
A
Retailer 5
-
$12,782 USD
View
B+
Retailer 6
-
$13,210 USD
View
B+
Retailer 7
-
$13,939 USD
View
B+
Retailer 8
-
$14,342 USD
View
B+
Retailer 9
-
$14,566 USD
View
B+
Retailer 10
-
$14,627 USD
View
B+
Retailer 11
-
$14,926 USD
View
B+
Retailer 12
-
$15,126 USD
View
B+
Retailer 13
-
$16,726 USD
View
B
Retailer 14
-
$18,972 USD
View
Most Expensive
B
NZ Jewellers
4d6658a7-3260-4822-8dd1-ee7eb8b6e0c0 · Nov 5
$20,301 USD
View
14 more retailers have this diamond
Prices start from $10,598 USDSave up to $9,703 USD

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
$10,598 USD