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Radiant|Natural|GIA

1.21ct E SI1 Radiant Natural Diamond

EX • E/SI1 • GIA 2518450103

Certificate GIA 2518450103

Diamond specifications and retailer prices

From $5,603 AUD
As of November 6, 2026
Save $5,922 AUD (51%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $11,525 AUD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.21ct natural radiant diamond

This 1.21ct natural radiant sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2518450103. Listed at 14 retailers as of November 5, 2026, with prices from $5,603 to $11,525, a $5,922 spread on the same certified stone. NZ Jewellers lists it at $11,525. 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

1.21
Carat
E
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.29°
Pavilion angle30.5°
OriginNatural
Grading LabGIA
CertificateGIA 2518450103
Dimensions6.67 × 5.23 × 3.64 mm
L/W Ratio1.28
Top View
6.67 mm5.23 mm1.21 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2518450103
Side View
Table 65.0%Crown 44.29°Girdle: THK-VTKPavilion 30.5°Culet: NoneDepth 69.7%

Caratlytics Score

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

Price History

Last verified: Nov 6
Current: $11,525 AUD|Low: $5,603 AUD|High: $11,921 AUD|Avg: $7,690 AUD|-3.3%
NZ Jewellers
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 5$5,603 AUD
Retailer 10$5,711 AUD
Retailer 4$5,929 AUD
Retailer 12$6,149 AUD
Retailer 2$6,575 AUD
Retailer 6$6,589 AUD
Retailer 3$6,811 AUD
Retailer 13$6,811 AUD
Retailer 7$7,027 AUD
Retailer 14$7,044 AUD
Retailer 8$7,107 AUD
Retailer 11$9,662 AUD
Retailer 9$10,507 AUD
NZ Jewellers$11,525 AUD

43 data points across 14 retailers

14 retailers$5,603 AUD to $11,525 AUD

B+
Cheapest Retailer
-
$5,603 AUD
B+
Retailer 2
-
$5,711 AUD
View
B+
Retailer 3
-
$5,929 AUD
View
B+
Retailer 4
-
$6,149 AUD
View
B+
Retailer 5
-
$6,575 AUD
View
B+
Retailer 6
-
$6,589 AUD
View
B+
Retailer 7
-
$6,811 AUD
View
B+
Retailer 8
-
$6,811 AUD
View
B
Retailer 9
-
$7,027 AUD
View
B
Retailer 10
-
$7,044 AUD
View
B+
Retailer 11
-
$7,107 AUD
View
B
Retailer 12
-
$9,662 AUD
View
B
Retailer 13
-
$10,507 AUD
View
Most Expensive
B
NZ Jewellers
c41f34da-ef32-4739-bab4-64ae197ec1fe · Nov 5
$11,525 AUD
$7,919 USD
View
13 more retailers have this diamond
Prices start from $5,603 AUDSave up to $5,922 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+
1.21ct Radiant
$5,603 AUD