CaratHunter
Plans
Radiant|Natural|GIA

1.21ct J SI1 Radiant Natural Diamond

EX • J/SI1 • GIA 1553030730

Certificate GIA 1553030730

Diamond specifications and retailer prices

From HK$42,643 HKD
$5,441 USD
As of November 5, 2026
1 retailer carries this diamond
Only listing: HK$42,643 HKD at Blue Nile
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Blue Nile

About this 1.21ct natural radiant diamond

This 1.21ct natural radiant sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1553030730. Listed at a single retailer as of November 5, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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 (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Pavilion angle56.05°
OriginNatural
Grading LabGIA
CertificateGIA 1553030730
Dimensions7.32 × 5.29 × 3.63 mm
L/W Ratio1.38
Key to symbols
Cloud, Crystal, Feather, Twinning Wisp, Needle
Top View
7.32 mm5.29 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 1553030730
Side View
Table 68.0%CrownGirdle: THK-VTKPavilion 56.05°Culet: NoneDepth 68.7%

Caratlytics Score

How it works →
C
Average
Compare with similar diamonds
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$42,643 HKD|Low: HK$12,634 HKD|High: HK$42,643 HKD|Avg: HK$17,321 HKD
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
September 26, 2026
Retailer 2HK$12,634 HKD
Retailer 3HK$16,184 HKD
Retailer 4HK$16,968 HKD
Retailer 5HK$19,860 HKD
Blue NileHK$42,643 HKD

50 data points across 5 retailers

1 retailer

C
Blue Nile
29658828 · Nov 5
HK$42,643 HKD
$5,441 USD
View

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.

C
1.21ct Radiant
HK$42,643 HKD