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Round|Natural|GIA

1.21ct J SI2 Round Natural Diamond

GD • J/SI2 • GIA 17427766

Certificate GIA 17427766

Diamond specifications and retailer prices

From HK$18,830 HKD
$2,400 USD
As of October 30, 2026
Save HK$18,017 HKD (49%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: HK$43,967 HKD at NZ Jewellers · As of September 28, 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 J colour (near-colourless) and SI2 clarity (slightly-included), with a standard cut grade and certified by GIA 17427766. Listed at 11 retailers as of October 30, 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. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.21
Carat
J
Colour
SI2
Clarity
Good
Cut

Specifications

CutGood
PolishVery Good
SymmetryVery Good
FluorescenceStrong
Crown angle33°
Pavilion angle40.2°
OriginNatural
Grading LabGIA
CertificateGIA 17427766
Dimensions6.91 × 6.94 × 4.04 mm
L/W Ratio1.00
Star length50%
Lower girdle85%
Key to symbols
Feather, Crystal, Knot
Top View
6.91 mm6.94 mm1.21 ctJ / SI2
OriginNatural
CutGood
PolishVery Good
SymmetryVery Good
FluorescenceStrong
CertificateGIA 17427766
Side View
Table 63.0%Crown 33°Girdle: STK-THKPavilion 40.2°Culet: NoneDepth 58.3%

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: Oct 30
Current: HK$20,236 HKD|Low: HK$16,178 HKD|High: HK$37,285 HKD|Avg: HK$24,186 HKD|-1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 1, 2026
Retailer 5HK$16,178 HKD
Retailer 1HK$20,236 HKD
Retailer 4HK$22,346 HKD
Retailer 2HK$24,557 HKD
Retailer 3HK$36,847 HKD

40 data points across 5 retailers

11 retailersHK$18,830 HKD to HK$36,847 HKD

B+
Cheapest Retailer
-
HK$18,830 HKD
$2,400 USD
B
Retailer 2
-
HK$20,236 HKD
£2,031 GBP
View
B
Retailer 3
-
HK$20,338 HKD
A$3,988 AUD
View
Retailer 4
-
HK$21,034 HKD
$2,681 USD
View
Price last confirmed 33 days ago
Retailer 5
-
HK$21,842 HKD
$2,784 USD
View
Price last confirmed 33 days ago
B
Retailer 6
-
HK$22,346 HKD
£2,243 GBP
View
Retailer 7
-
HK$24,267 HKD
$3,093 USD
View
Price last confirmed 33 days ago
B
Retailer 8
-
HK$24,557 HKD
€2,981 EUR
View
C
Retailer 9
-
HK$28,643 HKD
€3,477 EUR
View
C
Retailer 10
-
HK$36,847 HKD
£3,698 GBP
View
Most Expensive
NZ Jewellers
0d78096f-79e7-4b7b-a025-93a553bf2cb8 · Sep 28
HK$43,967 HKD
$5,604 USD
View
Price last confirmed 34 days ago
10 more retailers have this diamond
Prices start from HK$18,830 HKDSave up to HK$18,017 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 Round
HK$18,830 HKD