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Round|Natural|GIA

1.21ct F SI2 Round Natural Diamond

EX • F/SI2 • GIA 2557099524

Certificate GIA 2557099524

Diamond specifications and retailer prices

From HK$17,556 HKD
As of November 6, 2026
Save HK$21,106 HKD (55%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: HK$48,835 HKD at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded F colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2557099524. Listed at 17 retailers as of November 2, 2026, with a 120% 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2557099524
Dimensions6.79 × 6.84 × 4.16 mm
L/W Ratio1.01
Top View
6.79 mm6.84 mm1.21 ctF / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2557099524
Side View
Table 61.0%Crown 35.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.0%

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: HK$18,285 HKD|Low: HK$17,454 HKD|High: HK$39,532 HKD|Avg: HK$24,160 HKD|-2.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 11HK$17,556 HKD
Retailer 1HK$18,285 HKD
Retailer 7HK$20,510 HKD
Retailer 10HK$21,302 HKD
Retailer 2HK$21,341 HKD
Retailer 3HK$23,363 HKD
Retailer 9HK$24,014 HKD
Retailer 5HK$24,327 HKD
Retailer 4HK$24,468 HKD
Retailer 6HK$26,859 HKD
Retailer 8HK$38,662 HKD

38 data points across 11 retailers

17 retailersHK$17,556 HKD to HK$38,662 HKD

A
Cheapest Retailer
-
HK$17,556 HKD
A
Retailer 2
-
HK$18,285 HKD
View
A
Retailer 3
-
HK$20,510 HKD
View
A
Retailer 4
-
HK$21,302 HKD
View
A
Retailer 5
-
HK$21,341 HKD
View
Final sale: no returns
A
Retailer 6
-
HK$21,772 HKD
View
Retailer 7
-
HK$23,363 HKD
View
Price last confirmed 44 days ago
Retailer 8
-
HK$23,363 HKD
View
Price last confirmed 18 days ago
Retailer 9
-
HK$23,363 HKD
View
Price last confirmed 22 days ago
A
Retailer 10
-
HK$24,014 HKD
View
A
Retailer 11
-
HK$24,327 HKD
View
B+
Retailer 12
-
HK$24,468 HKD
View
B+
Retailer 13
-
HK$26,859 HKD
View
Retailer 14
-
HK$26,953 HKD
View
Price last confirmed 46 days ago
B
Retailer 15
-
HK$38,662 HKD
View
Retailer 16
-
HK$48,835 HKD
View
Price last confirmed 43 days ago
Most Expensive
NZ Jewellers
7f9bf449-dab7-4491-b009-3dc9b40f010e · Oct 17
HK$48,835 HKD
$6,231 USD
View
Price last confirmed 20 days ago
16 more retailers have this diamond
Prices start from HK$17,556 HKDSave up to HK$21,106 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.

A
1.21ct Round
HK$17,556 HKD