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Marquise|Natural|GIA

1.21ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 1553370505

Certificate GIA 1553370505

Diamond specifications and retailer prices

From $5,478 AUD
As of November 6, 2026
Save $2,575 AUD (32%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: $8,054 AUD at 77 Diamonds · As of November 7, 2026
View at 77 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 1553370505. Listed at 4 retailers as of November 6, 2026, with prices from $5,478 to $8,054, a $2,575 spread on the same certified stone. 77 Diamonds lists it at $8,054. 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
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle38.8°
Pavilion angle42.26°
OriginNatural
Grading LabGIA
CertificateGIA 1553370505
Dimensions10.29 × 5.55 × 3.59 mm
L/W Ratio1.85
Culet sizeNone
Top View
10.29 mm5.55 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1553370505
Side View
Table 61.0%Crown 38.8°Girdle: MED-VTKPavilion 42.26°Culet: NoneDepth 64.8%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 6
Current: $8,054 AUD|Low: $3,419 AUD|High: $8,264 AUD|Avg: $5,937 AUD|-1.5%
77 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 7, 2026
Retailer 6$3,419 AUD
Retailer 10$4,807 AUD
Retailer 3$4,954 AUD
Retailer 12$4,986 AUD
Retailer 9$5,306 AUD
Retailer 5$5,478 AUD
Retailer 11$5,790 AUD
Retailer 13$5,873 AUD
Retailer 7$6,308 AUD
Retailer 14$6,666 AUD
Retailer 8$7,283 AUD
Retailer 2$7,763 AUD
77 Diamonds$8,054 AUD
Retailer 4$8,264 AUD

19 data points across 14 retailers

4 retailers$5,478 AUD to $8,054 AUD

B
Cheapest Retailer
-
$5,478 AUD
B
Retailer 2
-
$6,308 AUD
View
B
Retailer 3
-
$7,763 AUD
View
Most Expensive
B
77 Diamonds
MQMB5GFDMHAR · Nov 7
$8,054 AUD
£4,357 GBP
View
3 more retailers have this diamond
Prices start from $5,478 AUDSave up to $2,575 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
$5,478 AUD