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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 $4,135 AUD
As of October 31, 2026
Save $3,573 AUD (46%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $7,708 AUD 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 $4,135 to $7,708, a $3,573 spread on the same certified stone. Helzberg Diamonds lists it at $7,708. 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: $7,708 AUD|Low: $4,135 AUD|High: $8,358 AUD|Avg: $5,490 AUD|-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$4,135 AUD
Retailer 2$4,235 AUD
Retailer 13$4,362 AUD
Retailer 8$4,381 AUD
Retailer 14$4,458 AUD
Retailer 12$4,739 AUD
Retailer 11$4,883 AUD
Retailer 9$5,209 AUD
Retailer 5$5,283 AUD
Retailer 10$5,330 AUD
Retailer 7$5,401 AUD
Retailer 6$6,974 AUD
Retailer 4$7,395 AUD
Helzberg Diamonds$7,708 AUD

35 data points across 14 retailers

14 retailers$4,135 AUD to $7,708 AUD

B+
Cheapest Retailer
-
$4,135 AUD
B+
Retailer 2
-
$4,235 AUD
View
B+
Retailer 3
-
$4,362 AUD
View
B+
Retailer 4
-
$4,381 AUD
View
B+
Retailer 5
-
$4,458 AUD
View
B
Retailer 6
-
$4,739 AUD
View
B
Retailer 7
-
$4,883 AUD
View
B
Retailer 8
-
$5,209 AUD
View
B
Retailer 9
-
$5,283 AUD
View
B
Retailer 10
-
$5,330 AUD
View
B
Retailer 11
-
$5,401 AUD
View
B
Retailer 12
-
$6,974 AUD
View
Retailer 13
-
$7,395 AUD
View
Price last confirmed 11 days ago
Most Expensive
B
Helzberg Diamonds
XZRLIKHGKLLLL · Nov 3
$7,708 AUD
$5,296 USD
View
13 more retailers have this diamond
Prices start from $4,135 AUDSave up to $3,573 AUD

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
$4,135 AUD