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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 $18,853 NZD
As of November 5, 2026
Save $17,261 NZD (48%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $36,113 NZD 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 $18,853 to $36,113, a $17,261 spread on the same certified stone. NZ Jewellers lists it at $36,113. 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 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: $24,796 NZD|Low: $18,853 NZD|High: $34,203 NZD|Avg: $25,812 NZD|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 4$18,853 NZD
Retailer 5$22,738 NZD
Retailer 1$24,796 NZD
Retailer 7$25,513 NZD
Retailer 8$25,911 NZD
Retailer 3$26,020 NZD
Retailer 2$29,754 NZD
Retailer 6$33,749 NZD

29 data points across 8 retailers

15 retailers$18,853 NZD to $36,113 NZD

A
Cheapest Retailer
-
$18,853 NZD
A
Retailer 2
-
$21,925 NZD
View
A
Retailer 3
-
$22,190 NZD
View
A
Retailer 4
-
$22,676 NZD
View
A
Retailer 5
-
$22,738 NZD
View
B+
Retailer 6
-
$23,499 NZD
View
B+
Retailer 7
-
$24,796 NZD
View
B+
Retailer 8
-
$25,513 NZD
View
B+
Retailer 9
-
$25,911 NZD
View
B+
Retailer 10
-
$26,020 NZD
View
B+
Retailer 11
-
$26,552 NZD
View
B+
Retailer 12
-
$26,908 NZD
View
B+
Retailer 13
-
$29,754 NZD
View
B
Retailer 14
-
$33,749 NZD
View
Most Expensive
B
NZ Jewellers
4d6658a7-3260-4822-8dd1-ee7eb8b6e0c0 · Nov 5
$36,113 NZD
$20,301 USD
View
14 more retailers have this diamond
Prices start from $18,853 NZDSave up to $17,261 NZD

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
$18,853 NZD