Marquise|Natural|GIA

1.21ct I SI2 Marquise Natural Diamond

EX • I/SI2 • GIA 6555960270

Certificate GIA 6555960270

Diamond specifications and retailer prices

From $2,979 USD
As of November 4, 2026
Save $2,686 USD (47%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $5,665 USD at Helzberg Diamonds · As of November 6, 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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6555960270. Listed at 12 retailers as of November 4, 2026, with prices from $2,979 to $5,665, a $2,686 spread on the same certified stone. Helzberg Diamonds lists it at $5,665. 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
I
Color
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.95°
Pavilion angle37.98°
OriginNatural
Grading LabGIA
CertificateGIA 6555960270
Dimensions11.13 × 5.44 × 3.28 mm
L/W Ratio2.05
Culet sizeNone
Top View
11.13 mm5.44 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6555960270
Side View
Table 58.0%Crown 36.95°Girdle: ThickPavilion 37.98°Culet: NDepth 60.2%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $5,665 USD|Low: $2,979 USD|High: $6,020 USD|Avg: $3,933 USD|-5.9%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 8$2,979 USD
Retailer 2$3,047 USD
Retailer 7$3,051 USD
Retailer 9$3,211 USD
Retailer 6$3,455 USD
Retailer 3$3,589 USD
Retailer 10$3,780 USD
Retailer 11$3,815 USD
Retailer 12$3,887 USD
Retailer 5$3,960 USD
Retailer 4$5,316 USD
Helzberg Diamonds$5,665 USD

37 data points across 12 retailers

12 retailers$2,979 USD to $5,665 USD

A
Cheapest Retailer
-
$2,979 USD
A
Retailer 2
-
$3,047 USD
View
A
Retailer 3
-
$3,051 USD
View
A
Retailer 4
-
$3,211 USD
View
B+
Retailer 5
-
$3,455 USD
View
B+
Retailer 6
-
$3,589 USD
View
B+
Retailer 7
-
$3,780 USD
View
B+
Retailer 8
-
$3,815 USD
View
B+
Retailer 9
-
$3,887 USD
View
B+
Retailer 10
-
$3,960 USD
View
B
Retailer 11
-
$5,316 USD
View
Most Expensive
B
Helzberg Diamonds
XZRMLLLPMGING · Nov 6
$5,665 USD
View
11 more retailers have this diamond
Prices start from $2,979 USDSave up to $2,686 USD

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.

A
1.21ct Marquise
$2,979 USD