Round|Natural|GIA

1.21ct J SI2 Round Natural Diamond

EX • J/SI2 • GIA 1559331104

Certificate GIA 1559331104

Diamond specifications and retailer prices

From $3,223 CAD
$2,307 USD
As of October 31, 2026
12 retailers carry this diamond
Most expensive: $4,417 CAD at Helzberg Diamonds · As of October 20, 2026
View at Helzberg Diamonds

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 top-tier cut grade and certified by GIA 1559331104. Listed at 12 retailers as of October 31, 2026. 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
Color
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1559331104
Dimensions6.77 × 6.80 × 4.26 mm
L/W Ratio1.00
Culet sizeNone
Top View
6.77 mm6.80 mm1.21 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1559331104
Side View
Table 57.0%Crown 36.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.7%

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 31
Current: $4,417 CAD|Low: $2,452 CAD|High: $4,696 CAD|Avg: $3,181 CAD|-5.9%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 22, 2026
Retailer 13$2,452 CAD
Retailer 4$2,493 CAD
Retailer 12$2,515 CAD
Retailer 10$2,650 CAD
Retailer 11$2,669 CAD
Retailer 9$2,685 CAD
Retailer 7$2,950 CAD
Retailer 8$3,199 CAD
Retailer 5$3,218 CAD
Retailer 6$3,229 CAD
Retailer 2$3,457 CAD
Retailer 3$4,113 CAD
Helzberg Diamonds$4,417 CAD

33 data points across 13 retailers

12 retailers

Retailer 1
-
$2,452 CAD
SGD 2,372 SGD
Price last confirmed 9 days ago
Retailer 2
-
$2,493 CAD
$1,785 USD
View
Price last confirmed 11 days ago
Retailer 3
-
$2,515 CAD
$1,801 USD
View
Price last confirmed 14 days ago
Retailer 4
-
$2,650 CAD
£1,494 GBP
View
Price last confirmed 11 days ago
Retailer 5
-
$2,669 CAD
$1,911 USD
View
Price last confirmed 11 days ago
Retailer 6
-
$2,685 CAD
SGD 2,597 SGD
View
Price last confirmed 11 days ago
Retailer 7
-
$2,950 CAD
$2,112 USD
View
Price last confirmed 11 days ago
B+
Retailer 8
-
$3,223 CAD
$2,307 USD
View
Retailer 9
-
$3,229 CAD
£1,820 GBP
View
Price last confirmed 10 days ago
Retailer 10
-
$3,457 CAD
€2,357 EUR
View
Price last confirmed 9 days ago
Retailer 11
-
$4,113 CAD
$2,944 USD
View
Price last confirmed 11 days ago
Most Expensive
Helzberg Diamonds
XZRHLLPJJHHGK · Oct 20
$4,417 CAD
$3,162 USD
View
Price last confirmed 11 days ago
11 more retailers have this diamond
Prices start from $3,223 CAD

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
$3,223 CAD