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1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1563314290

Certificate GIA 1563314290

Diamond specifications and retailer prices

From $3,867 SGD
As of October 31, 2026
Save $3,489 SGD (47%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $7,355 SGD at Helzberg Diamonds · As of November 1, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1563314290. Listed at 15 retailers as of October 31, 2026, with prices from $3,867 to $7,355, a $3,489 spread on the same certified stone. Helzberg Diamonds lists it at $7,355. 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 1563314290
Dimensions6.85 × 6.89 × 4.20 mm
L/W Ratio1.01
Culet sizeNone
Top View
6.85 mm6.89 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1563314290
Side View
Table 58.0%Crown 33°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 61.2%

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: Oct 31
Current: $7,355 SGD|Low: $3,867 SGD|High: $7,634 SGD|Avg: $5,227 SGD|-3.7%
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
Retailer 14
Retailer 15
Retailer 16
November 2, 2026
Retailer 12$3,867 SGD
Retailer 8$4,088 SGD
Retailer 14$4,116 SGD
Retailer 4$4,168 SGD
Retailer 11$4,216 SGD
Retailer 2$4,527 SGD
Retailer 3$4,652 SGD
Retailer 6$4,657 SGD
Retailer 13$4,948 SGD
Retailer 5$5,038 SGD
Retailer 9$5,148 SGD
Retailer 16$5,321 SGD
Retailer 10$5,365 SGD
Retailer 15$6,522 SGD
Retailer 7$7,074 SGD
Helzberg Diamonds$7,355 SGD

35 data points across 16 retailers

15 retailers$3,867 SGD to $7,355 SGD

A
Cheapest Retailer
-
$3,867 SGD
B+
Retailer 2
-
$4,116 SGD
View
B+
Retailer 3
-
$4,168 SGD
View
B+
Retailer 4
-
$4,216 SGD
View
B+
Retailer 5
-
$4,527 SGD
View
B+
Retailer 6
-
$4,652 SGD
View
B+
Retailer 7
-
$4,657 SGD
View
B+
Retailer 8
-
$4,948 SGD
View
B+
Retailer 9
-
$5,038 SGD
View
B+
Retailer 10
-
$5,148 SGD
View
B+
Retailer 11
-
$5,321 SGD
View
B+
Retailer 12
-
$5,365 SGD
View
B
Retailer 13
-
$6,522 SGD
View
Retailer 14
-
$7,074 SGD
View
Price last confirmed 16 days ago
Most Expensive
B
Helzberg Diamonds
XZRHLMJJHKIPG · Nov 1
$7,355 SGD
$5,739 USD
View
14 more retailers have this diamond
Prices start from $3,867 SGDSave up to $3,489 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
$3,867 SGD