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Round|Natural|GIA

2.51ct K SI2 Round Natural Diamond

EX • K/SI2 • GIA 2556315284

Certificate GIA 2556315284

Diamond specifications and retailer prices

From $18,255 NZD
As of November 6, 2026
Save $8,162 NZD (31%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $28,267 NZD at NZ Jewellers · As of October 3, 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2556315284. Listed at 11 retailers as of November 4, 2026, with a 45% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
FluorescenceFaint
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2556315284
Dimensions8.58 × 8.65 × 5.41 mm
L/W Ratio1.01
Star length50%
Culet sizeNone
Key to symbols
Crystal, Feather, Needle
Top View
8.58 mm8.65 mm2.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2556315284
Side View
Table 58.0%Crown 36°GirdlePavilion 40.8°Culet: NoneDepth 62.8%

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: $28,267 NZD|Low: $18,253 NZD|High: $28,267 NZD|Avg: $22,698 NZD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 3$18,255 NZD
Retailer 6$18,721 NZD
Retailer 8$20,281 NZD
Retailer 4$21,204 NZD
Retailer 7$23,401 NZD
Retailer 2$24,093 NZD
Retailer 5$26,417 NZD
NZ Jewellers$28,267 NZD

38 data points across 8 retailers

11 retailers$18,255 NZD to $26,417 NZD

A
Cheapest Retailer
-
$18,255 NZD
Retailer 2
-
$18,721 NZD
View
Price last confirmed 29 days ago
Retailer 3
-
$18,721 NZD
View
Price last confirmed 12 days ago
Retailer 4
-
$18,721 NZD
View
Price last confirmed 8 days ago
Retailer 5
-
$20,281 NZD
View
Price last confirmed 29 days ago
Retailer 6
-
$20,505 NZD
View
Price last confirmed 38 days ago
A
Retailer 7
-
$21,204 NZD
View
Retailer 8
-
$23,401 NZD
View
Price last confirmed 35 days ago
B+
Retailer 9
-
$24,093 NZD
View
B+
Retailer 10
-
$26,417 NZD
View
Most Expensive
NZ Jewellers
570a218d-0d78-4d62-9c53-7a3c13617865 · Oct 3
$28,267 NZD
$15,890 USD
View
Price last confirmed 33 days ago
10 more retailers have this diamond
Prices start from $18,255 NZDSave up to $8,162 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
$18,255 NZD