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Round|Natural|GIA

1.21ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 2243122857

Certificate GIA 2243122857

Diamond specifications and retailer prices

From $2,807 SGD
As of November 6, 2026
Save $2,265 SGD (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $5,071 SGD at Helzberg Diamonds · As of November 6, 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2243122857. Listed at 12 retailers as of November 6, 2026, with prices from $2,807 to $5,071, a $2,265 spread on the same certified stone. Helzberg Diamonds lists it at $5,071. 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
FluorescenceMedium
Crown angle34°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 2243122857
Dimensions6.81 × 6.83 × 4.25 mm
L/W Ratio1.00
Culet sizeNone
Top View
6.81 mm6.83 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2243122857
Side View
Table 56.0%Crown 34°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 62.3%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $5,071 SGD|Low: $2,807 SGD|High: $5,071 SGD|Avg: $3,689 SGD
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 2$2,807 SGD
Retailer 7$3,010 SGD
Retailer 3$3,066 SGD
Retailer 11$3,081 SGD
Retailer 8$3,178 SGD
Retailer 5$3,523 SGD
Retailer 10$3,527 SGD
Retailer 6$3,550 SGD
Retailer 9$3,615 SGD
Retailer 12$4,314 SGD
Retailer 4$4,612 SGD
Helzberg Diamonds$5,071 SGD

3 data points across 12 retailers

12 retailers$2,807 SGD to $5,071 SGD

A
Cheapest Retailer
-
$2,807 SGD
B+
Retailer 2
-
$3,010 SGD
View
B+
Retailer 3
-
$3,066 SGD
View
B+
Retailer 4
-
$3,081 SGD
View
B+
Retailer 5
-
$3,178 SGD
View
B
Retailer 6
-
$3,523 SGD
View
B
Retailer 7
-
$3,527 SGD
View
B+
Retailer 8
-
$3,550 SGD
View
B
Retailer 9
-
$3,615 SGD
View
B
Retailer 10
-
$4,314 SGD
View
B
Retailer 11
-
$4,612 SGD
View
Most Expensive
B
Helzberg Diamonds
XZRIIKJHIIOLN · Nov 6
$5,071 SGD
$3,957 USD
View
11 more retailers have this diamond
Prices start from $2,807 SGDSave up to $2,265 SGD

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
$2,807 SGD