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Round|Natural|GIA

2.55ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 16

Certificate GIA 16

Diamond specifications and retailer prices

From $16,402 AUD
As of November 4, 2026
Save $12,199 AUD (43%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $28,601 AUD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 2.55ct natural round diamond

This 2.55ct 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. Listed at 11 retailers as of November 4, 2026, with prices from $16,402 to $28,601, a $12,199 spread on the same certified stone. NZ Jewellers lists it at $28,601. 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

2.55
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 16
Dimensions8.94 × 8.98 × 5.27 mm
L/W Ratio1.00
Top View
8.94 mm8.98 mm2.55 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 16
Side View
Table 59.0%CrownGirdle: THN-MEDPavilionCulet: 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 4
Current: $28,601 AUD|Low: $16,402 AUD|High: $28,601 AUD|Avg: $19,917 AUD|+11.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 5, 2026
Retailer 3$16,402 AUD
Retailer 5$17,161 AUD
Retailer 4$18,305 AUD
Retailer 6$18,592 AUD
Retailer 7$18,925 AUD
Retailer 2$21,242 AUD
NZ Jewellers$28,601 AUD

11 data points across 7 retailers

11 retailers$16,402 AUD to $28,601 AUD

A
Cheapest Retailer
-
$16,402 AUD
Retailer 2
-
$17,161 AUD
View
Price last confirmed 8 days ago
Retailer 3
-
$17,161 AUD
View
Price last confirmed 29 days ago
A
Retailer 4
-
$18,305 AUD
View
A
Retailer 5
-
$18,592 AUD
View
Retailer 6
-
$18,592 AUD
View
Price last confirmed 30 days ago
A
Retailer 7
-
$18,925 AUD
View
Retailer 8
-
$19,306 AUD
View
Price last confirmed 30 days ago
B+
Retailer 9
-
$21,242 AUD
View
Retailer 10
-
$25,763 AUD
View
Price last confirmed 31 days ago
Most Expensive
B
NZ Jewellers
7476029c-3922-4cf1-8c9b-6bb374f9ba40 · Nov 5
$28,601 AUD
$20,022 USD
View
10 more retailers have this diamond
Prices start from $16,402 AUDSave up to $12,199 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
2.55ct Round
$16,402 AUD