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Marquise|Natural|GIA

1.20ct I SI1 Marquise Natural Diamond

GD • I/SI1 • GIA 5553831752

Certificate GIA 5553831752

Diamond specifications and retailer prices

From $6,193 NZD
As of November 4, 2026
Save $4,905 NZD (44%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $11,098 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 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 $6,193 to $11,098, a $4,905 spread on the same certified stone. Helzberg Diamonds lists it at $11,098. 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
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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $11,098 NZD|Low: $6,193 NZD|High: $11,913 NZD|Avg: $8,189 NZD|-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 7, 2026
Retailer 9$6,193 NZD
Retailer 11$6,294 NZD
Retailer 7$6,344 NZD
Retailer 10$6,619 NZD
Retailer 4$6,761 NZD
Retailer 2$7,149 NZD
Retailer 8$7,818 NZD
Retailer 13$7,874 NZD
Retailer 3$7,957 NZD
Retailer 6$7,961 NZD
Retailer 12$10,446 NZD
Retailer 5$11,043 NZD
Helzberg Diamonds$11,098 NZD

33 data points across 13 retailers

13 retailers$6,193 NZD to $11,098 NZD

B+
Cheapest Retailer
-
$6,193 NZD
B+
Retailer 2
-
$6,294 NZD
View
B+
Retailer 3
-
$6,344 NZD
View
B+
Retailer 4
-
$6,619 NZD
View
B+
Retailer 5
-
$6,761 NZD
View
B
Retailer 6
-
$7,149 NZD
View
B
Retailer 7
-
$7,818 NZD
View
B
Retailer 8
-
$7,874 NZD
View
B
Retailer 9
-
$7,957 NZD
View
B
Retailer 10
-
$7,961 NZD
View
B
Retailer 11
-
$10,446 NZD
View
B
Retailer 12
-
$11,043 NZD
View
Most Expensive
B
Helzberg Diamonds
XZRLLLJOJHNLI · Nov 6
$11,098 NZD
$6,152 USD
View
12 more retailers have this diamond
Prices start from $6,193 NZDSave up to $4,905 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
$6,193 NZD