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Marquise|Natural|GIA

1.21ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 5241045555

Certificate GIA 5241045555

Diamond specifications and retailer prices

From $3,641 SGD
As of October 31, 2026
Save $3,146 SGD (46%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $6,787 SGD at Helzberg Diamonds · As of November 3, 2026
View at Helzberg Diamonds

About this 1.21ct natural marquise diamond

This 1.21ct natural marquise 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 5241045555. Listed at 14 retailers as of October 31, 2026, with prices from $3,641 to $6,787, a $3,146 spread on the same certified stone. Helzberg Diamonds lists it at $6,787. 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
PolishVery Good
SymmetryExcellent
FluorescenceFaint
Crown angle39.63°
Pavilion angle40.08°
OriginNatural
Grading LabGIA
CertificateGIA 5241045555
Dimensions11.24 × 5.28 × 3.40 mm
L/W Ratio2.13
Culet sizeNone
Top View
11.24 mm5.28 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceFaint
CertificateGIA 5241045555
Side View
Table 59.0%Crown 39.63°Girdle: STK-THKPavilion 40.08°Culet: NDepth 64.3%

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: $6,787 SGD|Low: $3,641 SGD|High: $7,360 SGD|Avg: $4,834 SGD|-7.8%
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
November 5, 2026
Retailer 3$3,641 SGD
Retailer 2$3,729 SGD
Retailer 13$3,841 SGD
Retailer 8$3,858 SGD
Retailer 14$3,926 SGD
Retailer 12$4,173 SGD
Retailer 11$4,300 SGD
Retailer 9$4,587 SGD
Retailer 5$4,652 SGD
Retailer 10$4,693 SGD
Retailer 7$4,756 SGD
Retailer 6$6,141 SGD
Retailer 4$6,512 SGD
Helzberg Diamonds$6,787 SGD

35 data points across 14 retailers

14 retailers$3,641 SGD to $6,787 SGD

B+
Cheapest Retailer
-
$3,641 SGD
B+
Retailer 2
-
$3,729 SGD
View
B+
Retailer 3
-
$3,841 SGD
View
B+
Retailer 4
-
$3,858 SGD
View
B+
Retailer 5
-
$3,926 SGD
View
B
Retailer 6
-
$4,173 SGD
View
B
Retailer 7
-
$4,300 SGD
View
B
Retailer 8
-
$4,587 SGD
View
B
Retailer 9
-
$4,652 SGD
View
B
Retailer 10
-
$4,693 SGD
View
B
Retailer 11
-
$4,756 SGD
View
B
Retailer 12
-
$6,141 SGD
View
Retailer 13
-
$6,512 SGD
View
Price last confirmed 11 days ago
Most Expensive
B
Helzberg Diamonds
XZRLIKHGKLLLL · Nov 3
$6,787 SGD
$5,296 USD
View
13 more retailers have this diamond
Prices start from $3,641 SGDSave up to $3,146 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.

B+
1.21ct Marquise
$3,641 SGD