Marquise|Natural|GIA

1.20ct I SI1 Marquise Natural Diamond

GD • I/SI1 • GIA 5553831752

Certificate GIA 5553831752

Diamond specifications and retailer prices

From $3,433 USD
As of November 4, 2026
Save $2,719 USD (44%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $6,152 USD at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.2ct natural marquise diamond

This 1.2ct natural marquise sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 5553831752. Listed at 13 retailers as of November 4, 2026, with prices from $3,433 to $6,152, a $2,719 spread on the same certified stone. Helzberg Diamonds lists it at $6,152. 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

1.20
Carat
I
Color
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle42.81°
Pavilion angle40.44°
OriginNatural
Grading LabGIA
CertificateGIA 5553831752
Dimensions10.07 × 5.44 × 3.66 mm
L/W Ratio1.85
Culet sizeNone
Top View
10.07 mm5.44 mm1.20 ctI / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5553831752
Side View
Table 60.0%Crown 42.81°Girdle: MED-VTKPavilion 40.44°Culet: NoneDepth 67.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $6,152 USD|Low: $3,433 USD|High: $6,604 USD|Avg: $4,543 USD|-6.8%
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
November 6, 2026
Retailer 9$3,433 USD
Retailer 11$3,489 USD
Retailer 7$3,517 USD
Retailer 10$3,669 USD
Retailer 4$3,748 USD
Retailer 6$3,940 USD
Retailer 8$4,334 USD
Retailer 13$4,365 USD
Retailer 3$4,411 USD
Retailer 2$4,413 USD
Retailer 12$5,791 USD
Retailer 5$6,122 USD
Helzberg Diamonds$6,152 USD

32 data points across 13 retailers

13 retailers$3,433 USD to $6,152 USD

B+
Cheapest Retailer
-
$3,433 USD
B+
Retailer 2
-
$3,489 USD
View
B+
Retailer 3
-
$3,517 USD
View
B+
Retailer 4
-
$3,669 USD
View
B+
Retailer 5
-
$3,748 USD
View
B
Retailer 6
-
$3,940 USD
View
B
Retailer 7
-
$4,334 USD
View
B
Retailer 8
-
$4,365 USD
View
B
Retailer 9
-
$4,411 USD
View
B
Retailer 10
-
$4,413 USD
View
B
Retailer 11
-
$5,791 USD
View
B
Retailer 12
-
$6,122 USD
View
Most Expensive
B
Helzberg Diamonds
XZRLLLJOJHNLI · Nov 6
$6,152 USD
View
12 more retailers have this diamond
Prices start from $3,433 USDSave up to $2,719 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.

B+
1.20ct Marquise
$3,433 USD