CaratHunter
Plans
Radiant|Natural|GIA

1.25ct K SI1 Radiant Natural Diamond

EX • K/SI1 • GIA 6551309782

Certificate GIA 6551309782

Diamond specifications and retailer prices

From $2,310 AUD
As of November 6, 2026
Save $2,989 AUD (56%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $6,394 AUD at NZ Jewellers · As of September 25, 2026
View at NZ Jewellers

About this 1.25ct natural radiant diamond

This 1.25ct natural radiant sits in the one-and-a-quarter to one-and-a-half carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551309782. Listed at 16 retailers as of November 1, 2026, with a 129% 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

1.25
Carat
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6551309782
Dimensions7.21 × 5.33 × 3.60 mm
L/W Ratio1.35
Girdle conditionPolished
Top View
7.21 mm5.33 mm1.25 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551309782
Side View
Table 67.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 67.5%

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: $2,562 AUD|Low: $2,253 AUD|High: $5,590 AUD|Avg: $3,251 AUD|-13.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
November 7, 2026
Retailer 4$2,310 AUD
Retailer 12$2,557 AUD
Retailer 13$2,560 AUD
Retailer 1$2,562 AUD
Retailer 8$2,591 AUD
Retailer 11$2,691 AUD
Retailer 2$2,838 AUD
Retailer 5$2,954 AUD
Retailer 7$3,010 AUD
Retailer 3$3,352 AUD
Retailer 10$3,733 AUD
Retailer 9$4,113 AUD
Retailer 14$4,634 AUD
Retailer 6$5,299 AUD

37 data points across 14 retailers

16 retailers$2,310 AUD to $5,299 AUD

A
Cheapest Retailer
-
$2,310 AUD
A
Retailer 2
-
$2,557 AUD
View
Final sale: no returns
A
Retailer 3
-
$2,560 AUD
View
A
Retailer 4
-
$2,562 AUD
View
A
Retailer 5
-
$2,591 AUD
View
A
Retailer 6
-
$2,691 AUD
View
A
Retailer 7
-
$2,838 AUD
View
A
Retailer 8
-
$2,954 AUD
View
A
Retailer 9
-
$3,010 AUD
View
A
Retailer 10
-
$3,091 AUD
View
A
Retailer 11
-
$3,352 AUD
View
A
Retailer 12
-
$3,733 AUD
View
A
Retailer 13
-
$4,113 AUD
View
B+
Retailer 14
-
$4,634 AUD
View
B+
Retailer 15
-
$5,299 AUD
View
Most Expensive
NZ Jewellers
b4f77107-2584-40c9-9b49-88b7a2938865 · Sep 25
$6,394 AUD
$4,393 USD
View
Price last confirmed 42 days ago
15 more retailers have this diamond
Prices start from $2,310 AUDSave up to $2,989 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
1.25ct Radiant
$2,310 AUD