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Round|Natural|GIA

2.51ct K SI1 Round Natural Diamond

VG • K/SI1 • GIA 1563044596

Certificate GIA 1563044596

Diamond specifications and retailer prices

From $18,018 AUD
As of November 5, 2026
Save $2,667 AUD (13%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $25,833 AUD at NZ Jewellers · As of October 27, 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 very-good cut grade and certified by GIA 1563044596. Listed at 8 retailers as of November 5, 2026, with a relatively tight 15% spread, which is unusual at this carat range and suggests competitive pricing across the listings. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

2.51
Carat
K
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceMedium
Crown angle38°
Pavilion angle39.8°
OriginNatural
Grading LabGIA
CertificateGIA 1563044596
Dimensions8.36 × 8.48 × 5.46 mm
L/W Ratio1.01
Girdle conditionThick
Key to symbols
Twinning Wisp, Feather, Crystal
Top View
8.36 mm8.48 mm2.51 ctK / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 1563044596
Side View
Table 55.0%Crown 38°Girdle: MED-THKPavilion 39.8°Culet: NoneDepth 64.8%

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 5
Current: $25,833 AUD|Low: $16,849 AUD|High: $26,902 AUD|Avg: $20,835 AUD|-4.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 7$16,849 AUD
Retailer 4$17,886 AUD
Retailer 3$18,018 AUD
Retailer 6$18,535 AUD
Retailer 8$18,820 AUD
Retailer 2$20,685 AUD
Retailer 5$24,337 AUD
NZ Jewellers$25,833 AUD

42 data points across 8 retailers

8 retailers$18,018 AUD to $20,685 AUD

Retailer 1
-
$16,849 AUD
Price last confirmed 6 days ago
Retailer 2
-
$17,886 AUD
View
Price last confirmed 7 days ago
A
Retailer 3
-
$18,018 AUD
View
Retailer 4
-
$18,535 AUD
View
Price last confirmed 8 days ago
Retailer 5
-
$18,820 AUD
View
Price last confirmed 8 days ago
B+
Retailer 6
-
$20,685 AUD
View
Retailer 7
-
$24,337 AUD
View
Price last confirmed 8 days ago
Most Expensive
NZ Jewellers
69f31337-20b2-4a4d-baff-ee185a908243 · Oct 27
$25,833 AUD
$18,084 USD
View
Price last confirmed 10 days ago
7 more retailers have this diamond
Prices start from $18,018 AUDSave up to $2,667 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
$18,018 AUD