Marquise|Natural|GIA

1.21ct I SI2 Marquise Natural Diamond

GD • I/SI2 • GIA 6551273825

Certificate GIA 6551273825

Diamond specifications and retailer prices

From $2,605 USD
As of November 5, 2026
Save $2,136 USD (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $4,741 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 standard cut grade stated by the retailer rather than the lab and certified by GIA 6551273825. Listed at 12 retailers as of November 5, 2026, with prices from $2,605 to $4,741, a $2,136 spread on the same certified stone. Helzberg Diamonds lists it at $4,741. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.21
Carat
I
Color
SI2
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.52°
Pavilion angle37.98°
OriginNatural
Grading LabGIA
CertificateGIA 6551273825
Dimensions9.85 × 5.41 × 3.52 mm
L/W Ratio1.82
Culet sizeNone
Top View
9.85 mm5.41 mm1.21 ctI / SI2
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551273825
Side View
Table 60.0%Crown 43.52°Girdle: MED-VTKPavilion 37.98°Culet: NoneDepth 65.1%

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 5
Current: $4,741 USD|Low: $2,543 USD|High: $5,139 USD|Avg: $3,498 USD|-7.7%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 7$2,605 USD
Retailer 2$2,711 USD
Retailer 8$2,757 USD
Retailer 6$2,929 USD
Retailer 3$3,002 USD
Retailer 4$3,038 USD
Retailer 10$3,223 USD
Retailer 5$3,314 USD
Retailer 11$3,325 USD
Retailer 9$4,472 USD
Helzberg Diamonds$4,741 USD

44 data points across 11 retailers

12 retailers$2,605 USD to $4,741 USD

A
Cheapest Retailer
-
$2,605 USD
A
Retailer 2
-
$2,711 USD
View
B+
Retailer 3
-
$2,757 USD
View
B+
Retailer 4
-
$2,929 USD
View
B+
Retailer 5
-
$3,002 USD
View
B+
Retailer 6
-
$3,038 USD
View
B+
Retailer 7
-
$3,223 USD
View
B+
Retailer 8
-
$3,314 USD
View
B+
Retailer 9
-
$3,325 USD
View
B
Retailer 10
-
$3,607 USD
View
B
Retailer 11
-
$4,472 USD
View
Most Expensive
B
Helzberg Diamonds
XZRMLLHINJOIL · Nov 6
$4,741 USD
View
11 more retailers have this diamond
Prices start from $2,605 USDSave up to $2,136 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
$2,605 USD