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Marquise|Natural|GIA

1.20ct K SI1 Marquise Natural Diamond

VG • K/SI1 • GIA 1555561508

Certificate GIA 1555561508

Diamond specifications and retailer prices

From $4,047 AUD
As of November 5, 2026
Save $4,184 AUD (51%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $8,599 AUD at NZ Jewellers · As of September 30, 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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 1555561508. Listed at 10 retailers as of November 4, 2026, with a 103% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
K
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle39.97°
Pavilion angle40.64°
OriginNatural
Grading LabGIA
CertificateGIA 1555561508
Dimensions10.39 × 5.47 × 3.54 mm
L/W Ratio1.90
Culet sizeNone
Top View
10.39 mm5.47 mm1.20 ctK / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 1555561508
Side View
Table 60.0%Crown 39.97°Girdle: MED-THKPavilion 40.64°Culet: NoneDepth 64.7%

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 5
Current: $5,126 AUD|Low: $3,633 AUD|High: $8,353 AUD|Avg: $5,127 AUD|+1.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 2$3,633 AUD
Retailer 3$3,981 AUD
Retailer 7$4,047 AUD
Retailer 12$4,283 AUD
Retailer 10$4,414 AUD
Retailer 9$4,905 AUD
Retailer 11$4,905 AUD
Retailer 1$5,126 AUD
Retailer 4$5,365 AUD
Retailer 6$5,753 AUD
Retailer 8$7,193 AUD
Retailer 5$8,232 AUD

40 data points across 12 retailers

10 retailers$4,047 AUD to $8,232 AUD

B+
Cheapest Retailer
-
$4,047 AUD
B
Retailer 2
-
$4,283 AUD
View
B
Retailer 3
-
$4,414 AUD
View
B
Retailer 4
-
$4,905 AUD
View
B
Retailer 5
-
$4,905 AUD
View
B
Retailer 6
-
$5,126 AUD
View
B
Retailer 7
-
$5,753 AUD
View
C
Retailer 8
-
$7,193 AUD
View
B
Retailer 9
-
$8,232 AUD
View
Most Expensive
NZ Jewellers
ce9108f9-6f9e-4a33-8266-5974e0a46584 · Sep 30
$8,599 AUD
$5,908 USD
View
Price last confirmed 37 days ago
9 more retailers have this diamond
Prices start from $4,047 AUDSave up to $4,184 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.

B+
1.20ct Marquise
$4,047 AUD