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Marquise|Natural|GIA

1.20ct K SI1 Marquise Natural Diamond

EX • K/SI1 • GIA 6542456377

Certificate GIA 6542456377

Diamond specifications and retailer prices

From $4,098 AUD
As of November 6, 2026
Save $5,341 AUD (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $9,440 AUD at NZ Jewellers · As of November 5, 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 top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6542456377. Listed at 20 retailers as of November 5, 2026, with prices from $4,098 to $9,440, a $5,341 spread on the same certified stone. NZ Jewellers lists it at $9,440. 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
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle38.23°
Pavilion angle39.12°
OriginNatural
Grading LabGIA
CertificateGIA 6542456377
Dimensions10.40 × 5.53 × 3.46 mm
L/W Ratio1.88
Girdle conditionVery Thick
Key to symbols
Feather, Crystal, Needle
Top View
10.40 mm5.53 mm1.20 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6542456377
Side View
Table 60.0%Crown 38.23°Girdle: THK-VTKPavilion 39.12°Culet: NoneDepth 62.7%

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 6
Current: $9,440 AUD|Low: $4,098 AUD|High: $9,440 AUD|Avg: $5,943 AUD
NZ Jewellers
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 8$4,098 AUD
Retailer 6$4,359 AUD
Retailer 12$4,439 AUD
Retailer 13$4,909 AUD
Retailer 14$4,909 AUD
Retailer 4$5,098 AUD
Retailer 2$5,257 AUD
Retailer 5$5,567 AUD
Retailer 7$5,574 AUD
Retailer 3$5,664 AUD
Retailer 11$6,316 AUD
Retailer 9$6,613 AUD
Retailer 10$9,038 AUD
NZ Jewellers$9,440 AUD

36 data points across 14 retailers

20 retailers$4,098 AUD to $9,440 AUD

B+
Cheapest Retailer
-
$4,098 AUD
B+
Retailer 2
-
$4,359 AUD
View
B+
Retailer 3
-
$4,439 AUD
View
B
Retailer 4
-
$4,574 AUD
View
B
Retailer 5
-
$4,737 AUD
View
B
Retailer 6
-
$4,909 AUD
View
Retailer 7
-
$4,909 AUD
View
Price last confirmed 8 days ago
B
Retailer 8
-
$4,927 AUD
View
B
Retailer 9
-
$5,066 AUD
View
B
Retailer 10
-
$5,098 AUD
View
B
Retailer 11
-
$5,257 AUD
View
B
Retailer 12
-
$5,567 AUD
View
Retailer 13
-
$5,567 AUD
View
Price last confirmed 28 days ago
B
Retailer 14
-
$5,574 AUD
View
B
Retailer 15
-
$5,664 AUD
View
Retailer 16
-
$6,136 AUD
View
Price last confirmed 22 days ago
B
Retailer 17
-
$6,316 AUD
View
B
Retailer 18
-
$6,613 AUD
View
B
Retailer 19
-
$9,038 AUD
View
Most Expensive
C
NZ Jewellers
11a171f1-1057-4f87-b4c5-efd38b187b1f · Nov 5
$9,440 AUD
$6,486 USD
View
19 more retailers have this diamond
Prices start from $4,098 AUDSave up to $5,341 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
$4,098 AUD