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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 $3,971 CAD
$2,841 USD
As of October 31, 2026
Save $3,581 CAD (47%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $7,552 CAD at Helzberg Diamonds · As of November 2, 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 $3,971 to $7,552, a $3,581 spread on the same certified stone. Helzberg Diamonds lists it at $7,552. 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
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: $7,552 CAD|Low: $3,971 CAD|High: $8,145 CAD|Avg: $5,318 CAD|-7.3%
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 2, 2026
Retailer 12$3,971 CAD
Retailer 11$4,044 CAD
Retailer 8$4,188 CAD
Retailer 9$4,280 CAD
Retailer 10$4,290 CAD
Retailer 7$4,642 CAD
Retailer 5$4,784 CAD
Retailer 3$5,073 CAD
Retailer 13$5,098 CAD
Retailer 4$5,210 CAD
Retailer 2$5,304 CAD
Retailer 6$6,696 CAD
Retailer 14$7,101 CAD
Helzberg Diamonds$7,552 CAD

34 data points across 14 retailers

14 retailers$3,971 CAD to $7,552 CAD

B+
Cheapest Retailer
-
$3,971 CAD
$2,841 USD
B+
Retailer 2
-
$4,044 CAD
SGD 3,911 SGD
View
B+
Retailer 3
-
$4,188 CAD
$2,997 USD
View
B+
Retailer 4
-
$4,280 CAD
$3,063 USD
View
B+
Retailer 5
-
$4,290 CAD
$3,070 USD
View
B
Retailer 6
-
$4,642 CAD
£2,615 GBP
View
B+
Retailer 7
-
$4,784 CAD
SGD 4,626 SGD
View
B
Retailer 8
-
$5,073 CAD
$3,630 USD
View
B
Retailer 9
-
$5,098 CAD
$3,648 USD
View
B
Retailer 10
-
$5,210 CAD
$3,728 USD
View
B
Retailer 11
-
$5,304 CAD
€3,615 EUR
View
B
Retailer 12
-
$6,696 CAD
$4,792 USD
View
B
Retailer 13
-
$7,101 CAD
$5,082 USD
View
Most Expensive
B
Helzberg Diamonds
XZRLIKHGKLLLL · Nov 2
$7,552 CAD
$5,404 USD
View
13 more retailers have this diamond
Prices start from $3,971 CADSave up to $3,581 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 Marquise
$3,971 CAD