Marquise|Natural|GIA

1.20ct I SI1 Marquise Natural Diamond

VG • I/SI1 • GIA 5241054637

Certificate GIA 5241054637

Diamond specifications and retailer prices

From $3,675 USD
As of November 4, 2026
Save $2,910 USD (44%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $6,585 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 very-good cut grade stated by the retailer rather than the lab and certified by GIA 5241054637. Listed at 14 retailers as of November 4, 2026, with prices from $3,675 to $6,585, a $2,910 spread on the same certified stone. Helzberg Diamonds lists it at $6,585. 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
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.62°
Pavilion angle40.02°
OriginNatural
Grading LabGIA
CertificateGIA 5241054637
Dimensions10.10 × 5.46 × 3.58 mm
L/W Ratio1.85
Culet sizeNone
Top View
10.10 mm5.46 mm1.20 ctI / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5241054637
Side View
Table 59.0%Crown 40.62°Girdle: STK-VTKPavilion 40.02°Culet: NDepth 65.6%

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: $6,585 USD|Low: $3,675 USD|High: $7,096 USD|Avg: $4,745 USD|-6.0%
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 6, 2026
Retailer 10$3,675 USD
Retailer 12$3,733 USD
Retailer 6$3,843 USD
Retailer 9$3,922 USD
Retailer 8$3,928 USD
Retailer 4$4,013 USD
Retailer 5$4,040 USD
Retailer 7$4,215 USD
Retailer 14$4,656 USD
Retailer 3$4,690 USD
Retailer 2$4,726 USD
Retailer 11$6,199 USD
Retailer 13$6,542 USD
Helzberg Diamonds$6,585 USD

35 data points across 14 retailers

14 retailers$3,675 USD to $6,585 USD

B+
Cheapest Retailer
-
$3,675 USD
B+
Retailer 2
-
$3,733 USD
View
B+
Retailer 3
-
$3,843 USD
View
B+
Retailer 4
-
$3,922 USD
View
B+
Retailer 5
-
$3,928 USD
View
B+
Retailer 6
-
$4,013 USD
View
B+
Retailer 7
-
$4,040 USD
View
B
Retailer 8
-
$4,215 USD
View
B
Retailer 9
-
$4,656 USD
View
B
Retailer 10
-
$4,690 USD
View
B
Retailer 11
-
$4,726 USD
View
B
Retailer 12
-
$6,199 USD
View
B
Retailer 13
-
$6,542 USD
View
Most Expensive
B
Helzberg Diamonds
XZRLIKHGLKMJN · Nov 6
$6,585 USD
View
13 more retailers have this diamond
Prices start from $3,675 USDSave up to $2,910 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
$3,675 USD