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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 $5,125 NZD
As of October 31, 2026
Save $4,429 NZD (46%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $9,553 NZD 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 $5,125 to $9,553, a $4,429 spread on the same certified stone. Helzberg Diamonds lists it at $9,553. 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: $9,553 NZD|Low: $5,125 NZD|High: $10,360 NZD|Avg: $6,805 NZD|-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$5,125 NZD
Retailer 2$5,249 NZD
Retailer 13$5,406 NZD
Retailer 8$5,430 NZD
Retailer 14$5,525 NZD
Retailer 12$5,873 NZD
Retailer 11$6,052 NZD
Retailer 9$6,456 NZD
Retailer 5$6,548 NZD
Retailer 10$6,606 NZD
Retailer 7$6,694 NZD
Retailer 6$8,644 NZD
Retailer 4$9,166 NZD
Helzberg Diamonds$9,553 NZD

35 data points across 14 retailers

14 retailers$5,125 NZD to $9,553 NZD

B+
Cheapest Retailer
-
$5,125 NZD
B+
Retailer 2
-
$5,249 NZD
View
B+
Retailer 3
-
$5,406 NZD
View
B+
Retailer 4
-
$5,430 NZD
View
B+
Retailer 5
-
$5,525 NZD
View
B
Retailer 6
-
$5,873 NZD
View
B
Retailer 7
-
$6,052 NZD
View
B
Retailer 8
-
$6,456 NZD
View
B
Retailer 9
-
$6,548 NZD
View
B
Retailer 10
-
$6,606 NZD
View
B
Retailer 11
-
$6,694 NZD
View
B
Retailer 12
-
$8,644 NZD
View
Retailer 13
-
$9,166 NZD
View
Price last confirmed 11 days ago
Most Expensive
B
Helzberg Diamonds
XZRLIKHGKLLLL · Nov 3
$9,553 NZD
$5,296 USD
View
13 more retailers have this diamond
Prices start from $5,125 NZDSave up to $4,429 NZD

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
$5,125 NZD