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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 HK$26,898 HKD
As of November 2, 2026
Save HK$25,699 HKD (49%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: HK$54,799 HKD 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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: HK$54,799 HKD|Low: HK$26,898 HKD|High: HK$66,845 HKD|Avg: HK$38,745 HKD|-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 5HK$26,898 HKD
Retailer 9HK$27,337 HKD
Retailer 3HK$28,168 HKD
Retailer 4HK$30,723 HKD
Retailer 6HK$31,295 HKD
Retailer 11HK$31,295 HKD
Retailer 2HK$32,486 HKD
Retailer 12HK$32,525 HKD
Retailer 14HK$32,525 HKD
Retailer 13HK$33,622 HKD
Retailer 7HK$34,994 HKD
Retailer 10HK$45,896 HKD
Retailer 8HK$52,597 HKD
NZ JewellersHK$54,799 HKD

39 data points across 14 retailers

15 retailersHK$26,898 HKD to HK$52,597 HKD

B+
Cheapest Retailer
-
HK$26,898 HKD
B+
Retailer 2
-
HK$27,337 HKD
View
B+
Retailer 3
-
HK$28,168 HKD
View
Retailer 4
-
HK$30,723 HKD
View
Price last confirmed 9 days ago
B+
Retailer 5
-
HK$31,295 HKD
View
B+
Retailer 6
-
HK$31,295 HKD
View
B+
Retailer 7
-
HK$32,486 HKD
View
Retailer 8
-
HK$32,525 HKD
View
Price last confirmed 8 days ago
Retailer 9
-
HK$32,525 HKD
View
Price last confirmed 8 days ago
Retailer 10
-
HK$33,622 HKD
View
Price last confirmed 8 days ago
B+
Retailer 11
-
HK$34,994 HKD
View
B
Retailer 12
-
HK$39,461 HKD
View
Retailer 13
-
HK$45,896 HKD
View
Price last confirmed 11 days ago
B
Retailer 14
-
HK$52,597 HKD
View
Most Expensive
NZ Jewellers
35a80dc2-e68c-4c01-970b-8ebe5c41a2e5 · Oct 30
HK$54,799 HKD
$6,992 USD
View
Price last confirmed 7 days ago
14 more retailers have this diamond
Prices start from HK$26,898 HKDSave up to HK$25,699 HKD

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
HK$26,898 HKD