Round|Natural|GIA

1.21ct J SI2 Round Natural Diamond

EX • J/SI2 • GIA 1559331104

Certificate GIA 1559331104

Diamond specifications and retailer prices

From $2,307 USD
As of October 31, 2026
12 retailers carry this diamond
Most expensive: $3,162 USD 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

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Oct 31
Current: $3,162 USD|Low: $1,755 USD|High: $3,362 USD|Avg: $2,277 USD|-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$1,755 USD
Retailer 4$1,785 USD
Retailer 12$1,801 USD
Retailer 10$1,897 USD
Retailer 11$1,911 USD
Retailer 9$1,922 USD
Retailer 7$2,112 USD
Retailer 8$2,290 USD
Retailer 5$2,304 USD
Retailer 6$2,311 USD
Retailer 2$2,475 USD
Retailer 3$2,944 USD
Helzberg Diamonds$3,162 USD

33 data points across 13 retailers

12 retailers

Retailer 1
-
$1,755 USD
SGD 2,372 SGD
Price last confirmed 9 days ago
Retailer 2
-
$1,785 USD
View
Price last confirmed 11 days ago
Retailer 3
-
$1,801 USD
View
Price last confirmed 14 days ago
Retailer 4
-
$1,897 USD
£1,494 GBP
View
Price last confirmed 12 days ago
Retailer 5
-
$1,911 USD
View
Price last confirmed 12 days ago
Retailer 6
-
$1,922 USD
SGD 2,597 SGD
View
Price last confirmed 12 days ago
Retailer 7
-
$2,112 USD
View
Price last confirmed 12 days ago
B+
Retailer 8
-
$2,307 USD
View
Retailer 9
-
$2,311 USD
£1,820 GBP
View
Price last confirmed 11 days ago
Retailer 10
-
$2,475 USD
€2,357 EUR
View
Price last confirmed 9 days ago
Retailer 11
-
$2,944 USD
View
Price last confirmed 12 days ago
Most Expensive
Helzberg Diamonds
XZRHLLPJJHHGK · Oct 20
$3,162 USD
View
Price last confirmed 12 days ago
11 more retailers have this diamond
Prices start from $2,307 USD

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
$2,307 USD