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Marquise|Natural|GIA

1.20ct I SI2 Marquise Natural Diamond

ID • I/SI2 • GIA 6551627000

Certificate GIA 6551627000

Diamond specifications and retailer prices

From $4,132 AUD
As of November 6, 2026
Save $5,043 AUD (55%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $9,175 AUD at NZ Jewellers · As of November 3, 2026
View at NZ Jewellers

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 SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551627000. Listed at 7 retailers as of November 3, 2026, with prices from $4,132 to $9,175, a $5,043 spread on the same certified stone. NZ Jewellers lists it at $9,175. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.20
Carat
I
Colour
SI2
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle36.78°
Pavilion angle36.76°
OriginNatural
Grading LabGIA
CertificateGIA 6551627000
Dimensions10.21 × 5.67 × 3.37 mm
L/W Ratio1.80
Girdle conditionExtremely Thick
Key to symbols
Crystal, Cavity, Indented Natural, Natural
Top View
10.21 mm5.67 mm1.20 ctI / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6551627000
Side View
Table 55.0%Crown 36.78°Girdle: THK-ETKPavilion 36.76°Culet: NoneDepth 59.5%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $9,175 AUD|Low: $4,132 AUD|High: $9,175 AUD|Avg: $5,443 AUD|+17.8%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 2, 2026
Retailer 5$4,132 AUD
Retailer 2$4,339 AUD
Retailer 7$4,388 AUD
Retailer 4$4,557 AUD
Retailer 6$4,570 AUD
Retailer 3$7,340 AUD
NZ Jewellers$9,175 AUD

28 data points across 7 retailers

7 retailers$4,132 AUD to $9,175 AUD

A
Cheapest Retailer
-
$4,132 AUD
A
Retailer 2
-
$4,339 AUD
View
A
Retailer 3
-
$4,388 AUD
View
A
Retailer 4
-
$4,557 AUD
View
B+
Retailer 5
-
$4,570 AUD
View
B
Retailer 6
-
$7,340 AUD
View
Most Expensive
C
NZ Jewellers
4624b2ba-83d1-4a60-95fc-56cc7e6a4270 · Nov 3
$9,175 AUD
$6,304 USD
View
6 more retailers have this diamond
Prices start from $4,132 AUDSave up to $5,043 AUD

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
1.20ct Marquise
$4,132 AUD