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Marquise|Natural|GIA

1.20ct I SI1 Marquise Natural Diamond

VG • I/SI1 • GIA 5241054637

Certificate GIA 5241054637

Diamond specifications and retailer prices

From $6,629 NZD
As of November 4, 2026
Save $5,249 NZD (44%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $11,879 NZD 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 $6,629 to $11,879, a $5,249 spread on the same certified stone. Helzberg Diamonds lists it at $11,879. 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
Colour
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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $11,879 NZD|Low: $6,629 NZD|High: $12,800 NZD|Avg: $8,560 NZD|-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$6,629 NZD
Retailer 12$6,734 NZD
Retailer 6$6,932 NZD
Retailer 9$7,075 NZD
Retailer 8$7,086 NZD
Retailer 4$7,239 NZD
Retailer 5$7,288 NZD
Retailer 7$7,603 NZD
Retailer 14$8,399 NZD
Retailer 3$8,460 NZD
Retailer 2$8,525 NZD
Retailer 11$11,182 NZD
Retailer 13$11,801 NZD
Helzberg Diamonds$11,879 NZD

35 data points across 14 retailers

14 retailers$6,629 NZD to $11,879 NZD

B+
Cheapest Retailer
-
$6,629 NZD
B+
Retailer 2
-
$6,734 NZD
View
B+
Retailer 3
-
$6,932 NZD
View
B+
Retailer 4
-
$7,075 NZD
View
B+
Retailer 5
-
$7,086 NZD
View
B+
Retailer 6
-
$7,239 NZD
View
B+
Retailer 7
-
$7,288 NZD
View
B
Retailer 8
-
$7,603 NZD
View
B
Retailer 9
-
$8,399 NZD
View
B
Retailer 10
-
$8,460 NZD
View
B
Retailer 11
-
$8,525 NZD
View
B
Retailer 12
-
$11,182 NZD
View
B
Retailer 13
-
$11,801 NZD
View
Most Expensive
B
Helzberg Diamonds
XZRLIKHGLKMJN · Nov 6
$11,879 NZD
$6,585 USD
View
13 more retailers have this diamond
Prices start from $6,629 NZDSave up to $5,249 NZD

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
$6,629 NZD