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Round|Natural|GIA

1.20ct D SI2 Round Natural Diamond

EX • D/SI2 • GIA 6551379543

Certificate GIA 6551379543

Diamond specifications and retailer prices

From $3,748 AUD
As of November 6, 2026
Save $4,538 AUD (55%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $9,026 AUD at Queensmith · As of October 28, 2026
View at Queensmith

About this 1.2ct natural round diamond

This 1.2ct natural round sits in the classic one-carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6551379543. Listed at 21 retailers as of November 4, 2026, with a 121% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
D
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6551379543
Dimensions6.72 × 6.76 × 4.23 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Indented Natural, Natural
Top View
6.72 mm6.76 mm1.20 ctD / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551379543
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.8%

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: $9,026 AUD|Low: $3,748 AUD|High: $9,062 AUD|Avg: $5,745 AUD|+2.7%
Queensmith
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 9$3,748 AUD
Retailer 2$3,888 AUD
Retailer 7$4,370 AUD
Retailer 3$4,754 AUD
Retailer 5$5,110 AUD
Retailer 4$5,210 AUD
Retailer 6$5,771 AUD
Retailer 8$8,287 AUD
Queensmith$9,026 AUD

27 data points across 9 retailers

21 retailers$3,748 AUD to $8,287 AUD

A
Cheapest Retailer
-
$3,748 AUD
A
Retailer 2
-
$3,888 AUD
View
A
Retailer 3
-
$4,370 AUD
View
A
Retailer 4
-
$4,585 AUD
View
Final sale: no returns
A
Retailer 5
-
$4,598 AUD
View
A
Retailer 6
-
$4,754 AUD
View
Retailer 7
-
$4,970 AUD
View
Price last confirmed 43 days ago
Retailer 8
-
$4,970 AUD
View
Price last confirmed 21 days ago
Retailer 9
-
$4,970 AUD
View
Price last confirmed 17 days ago
A
Retailer 10
-
$5,110 AUD
View
Retailer 11
-
$5,160 AUD
View
Price last confirmed 22 days ago
B+
Retailer 12
-
$5,175 AUD
View
B+
Retailer 13
-
$5,210 AUD
View
Retailer 14
-
$5,734 AUD
View
Price last confirmed 70 days ago
Retailer 15
-
$5,734 AUD
View
Price last confirmed 19 days ago
Retailer 16
-
$5,734 AUD
View
Price last confirmed 45 days ago
B+
Retailer 17
-
$5,771 AUD
View
B
Retailer 18
-
$8,287 AUD
View
Retailer 19
-
$8,657 AUD
View
Price last confirmed 20 days ago
Retailer 20
-
$8,657 AUD
View
Price last confirmed 42 days ago
Most Expensive
Queensmith
6551379543 · Oct 28
$9,026 AUD
£4,975 GBP
View
Price last confirmed 8 days ago
20 more retailers have this diamond
Prices start from $3,748 AUDSave up to $4,538 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 Round
$3,748 AUD