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Radiant|Natural|GIA

2.51ct K SI2 Radiant Natural Diamond

EX • K/SI2 • GIA 6491920108

Certificate GIA 6491920108

Diamond specifications and retailer prices

From $19,358 AUD
As of November 6, 2026
Save $5,473 AUD (22%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $24,831 AUD at 77 Diamonds · As of November 7, 2026
View at 77 Diamonds

About this 2.51ct natural radiant diamond

This 2.51ct natural radiant sits in the two to three carat band, graded K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6491920108. Listed at 5 retailers as of November 6, 2026, with prices from $19,358 to $24,831, a $5,473 spread on the same certified stone. 77 Diamonds lists it at $24,831. 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 (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6491920108
Dimensions8.97 × 6.82 × 4.40 mm
L/W Ratio1.32
Top View
8.97 mm6.82 mm2.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6491920108
Side View
Table 69.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 64.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $24,831 AUD|Low: $19,358 AUD|High: $25,327 AUD|Avg: $21,669 AUD|+0.5%
77 Diamonds
Retailer 2
Retailer 3
November 7, 2026
Retailer 3$19,358 AUD
Retailer 2$20,265 AUD
77 Diamonds$24,831 AUD

44 data points across 3 retailers

5 retailers$19,358 AUD to $24,831 AUD

B+
Cheapest Retailer
-
$19,358 AUD
B+
Retailer 2
-
$20,265 AUD
View
B+
Retailer 3
-
$20,568 AUD
View
B+
Retailer 4
-
$20,707 AUD
View
Most Expensive
B
77 Diamonds
RADZSCSCKRW3 · Nov 7
$24,831 AUD
£13,434 GBP
View
4 more retailers have this diamond
Prices start from $19,358 AUDSave up to $5,473 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.

B+
2.51ct Radiant
$19,358 AUD