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Radiant|Natural|GIA

1.21ct F SI1 Radiant Natural Diamond

ID • F/SI1 • GIA 5231753899

Certificate GIA 5231753899

Diamond specifications and retailer prices

From $4,995 AUD
As of November 2, 2026
Save $4,772 AUD (49%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $10,176 AUD at NZ Jewellers · As of October 30, 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 F 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 5231753899. Listed at 15 retailers as of November 1, 2026, with a 96% 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

1.21
Carat
F
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.84°
Pavilion angle31.37°
OriginNatural
Grading LabGIA
CertificateGIA 5231753899
Dimensions6.75 × 5.25 × 3.63 mm
L/W Ratio1.29
Top View
6.75 mm5.25 mm1.21 ctF / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5231753899
Side View
Table 65.0%Crown 44.84°Girdle: ThickPavilion 31.37°Culet: NoneDepth 69.2%

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 2
Current: $10,176 AUD|Low: $4,995 AUD|High: $12,413 AUD|Avg: $7,195 AUD|-18.0%
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 3, 2026
Retailer 5$4,995 AUD
Retailer 9$5,076 AUD
Retailer 3$5,231 AUD
Retailer 4$5,705 AUD
Retailer 6$5,811 AUD
Retailer 11$5,811 AUD
Retailer 2$6,033 AUD
Retailer 12$6,040 AUD
Retailer 14$6,040 AUD
Retailer 13$6,244 AUD
Retailer 7$6,498 AUD
Retailer 10$8,523 AUD
Retailer 8$9,767 AUD
NZ Jewellers$10,176 AUD

39 data points across 14 retailers

15 retailers$4,995 AUD to $9,767 AUD

B+
Cheapest Retailer
-
$4,995 AUD
B+
Retailer 2
-
$5,076 AUD
View
B+
Retailer 3
-
$5,231 AUD
View
Retailer 4
-
$5,705 AUD
View
Price last confirmed 9 days ago
B+
Retailer 5
-
$5,811 AUD
View
B+
Retailer 6
-
$5,811 AUD
View
B+
Retailer 7
-
$6,033 AUD
View
Retailer 8
-
$6,040 AUD
View
Price last confirmed 8 days ago
Retailer 9
-
$6,040 AUD
View
Price last confirmed 8 days ago
Retailer 10
-
$6,244 AUD
View
Price last confirmed 8 days ago
B+
Retailer 11
-
$6,498 AUD
View
B
Retailer 12
-
$7,328 AUD
View
Retailer 13
-
$8,523 AUD
View
Price last confirmed 11 days ago
B
Retailer 14
-
$9,767 AUD
View
Most Expensive
NZ Jewellers
35a80dc2-e68c-4c01-970b-8ebe5c41a2e5 · Oct 30
$10,176 AUD
$6,992 USD
View
Price last confirmed 7 days ago
14 more retailers have this diamond
Prices start from $4,995 AUDSave up to $4,772 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
$4,995 AUD