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Round|Natural|IGI

1.21ct J SI1 Round Natural Diamond

EX • J/SI1 • IGI 670478896

Shape and cutting style on the report: Round brilliant

Certificate IGI 670478896

Diamond specifications and retailer prices

From HK$13,841 HKD
As of November 5, 2026
Save HK$12,924 HKD (48%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: HK$37,823 HKD at NZ Jewellers · As of September 21, 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 670478896. Listed at 16 retailers as of November 4, 2026, with a 93% 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
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle40.8°
OriginNatural
Grading LabIGI
CertificateIGI 670478896
Dimensions6.86 × 6.91 × 4.19 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.86 mm6.91 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 670478896
Side View
Table 58.0%Crown 34.4°Girdle: MediumPavilion 40.8°Culet: NoneDepth 60.9%

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 5
Current: HK$33,199 HKD|Low: HK$13,841 HKD|High: HK$37,823 HKD|Avg: HK$19,322 HKD|-12.2%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 7, 2026
Retailer 7HK$13,841 HKD
Retailer 8HK$14,664 HKD
Retailer 9HK$15,502 HKD
Retailer 10HK$15,502 HKD
Retailer 6HK$15,636 HKD
Retailer 2HK$16,827 HKD
Retailer 4HK$18,692 HKD
Retailer 3HK$20,761 HKD
Retailer 5HK$26,765 HKD
NZ JewellersHK$33,199 HKD

29 data points across 10 retailers

16 retailersHK$13,841 HKD to HK$26,765 HKD

A
Cheapest Retailer
-
HK$13,841 HKD
A
Retailer 2
-
HK$14,664 HKD
View
Retailer 3
-
HK$15,502 HKD
View
Price last confirmed 57 days ago
Retailer 4
-
HK$15,502 HKD
View
Price last confirmed 45 days ago
Retailer 5
-
HK$15,502 HKD
View
Price last confirmed 16 days ago
A
Retailer 6
-
HK$15,636 HKD
View
Retailer 7
-
HK$15,879 HKD
View
Price last confirmed 22 days ago
A
Retailer 8
-
HK$16,827 HKD
View
Retailer 9
-
HK$17,893 HKD
View
Price last confirmed 61 days ago
Retailer 10
-
HK$17,893 HKD
View
Price last confirmed 46 days ago
B+
Retailer 11
-
HK$18,692 HKD
View
B+
Retailer 12
-
HK$20,761 HKD
View
B
Retailer 13
-
HK$26,765 HKD
View
Retailer 14
-
HK$33,199 HKD
View
Price last confirmed 18 days ago
Retailer 15
-
HK$37,823 HKD
View
Price last confirmed 58 days ago
Most Expensive
NZ Jewellers
4037a78b-fd2d-45af-aade-16b6d7d538be · Sep 21
HK$37,823 HKD
$4,826 USD
View
Price last confirmed 46 days ago
15 more retailers have this diamond
Prices start from HK$13,841 HKDSave up to HK$12,924 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$13,841 HKD