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Round|Natural|GIA

1.20ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 5566279707

Certificate GIA 5566279707

Diamond specifications and retailer prices

From $3,633 AUD
As of November 6, 2026
Save $4,443 AUD (55%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $9,011 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5566279707. Listed at 22 retailers as of November 2, 2026, with a 122% 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 5566279707
Dimensions6.75 × 6.70 × 4.23 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Needle, Indented Natural, Natural, Extra Facet
Top View
6.75 mm6.70 mm1.20 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 5566279707
Side View
Table 59.0%Crown 35.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.9%

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: $9,011 AUD|Low: $3,633 AUD|High: $9,038 AUD|Avg: $5,719 AUD|+2.7%
Queensmith
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 9$3,633 AUD
Retailer 3$3,775 AUD
Retailer 7$4,245 AUD
Retailer 10$4,468 AUD
Retailer 4$4,621 AUD
Retailer 5$4,937 AUD
Retailer 2$5,643 AUD
Retailer 6$5,894 AUD
Retailer 8$8,076 AUD
Queensmith$9,011 AUD

24 data points across 10 retailers

22 retailers$3,633 AUD to $8,076 AUD

A
Cheapest Retailer
-
$3,633 AUD
A
Retailer 2
-
$3,775 AUD
View
A
Retailer 3
-
$4,245 AUD
View
B+
Retailer 4
-
$4,324 AUD
View
B+
Retailer 5
-
$4,456 AUD
View
Final sale: no returns
B+
Retailer 6
-
$4,468 AUD
View
B+
Retailer 7
-
$4,468 AUD
View
B+
Retailer 8
-
$4,621 AUD
View
Retailer 9
-
$4,830 AUD
View
Price last confirmed 20 days ago
Retailer 10
-
$4,830 AUD
View
Price last confirmed 26 days ago
B+
Retailer 11
-
$4,876 AUD
View
B+
Retailer 12
-
$4,937 AUD
View
Retailer 13
-
$5,015 AUD
View
Price last confirmed 23 days ago
B+
Retailer 14
-
$5,039 AUD
View
B+
Retailer 15
-
$5,062 AUD
View
Retailer 16
-
$5,178 AUD
View
Price last confirmed 34 days ago
Retailer 17
-
$5,573 AUD
View
Price last confirmed 20 days ago
B
Retailer 18
-
$5,643 AUD
View
B+
Retailer 19
-
$5,894 AUD
View
B
Retailer 20
-
$8,076 AUD
View
Retailer 21
-
$8,415 AUD
View
Price last confirmed 21 days ago
Most Expensive
Queensmith
5566279707 · Oct 28
$9,011 AUD
£4,875 GBP
View
Price last confirmed 9 days ago
21 more retailers have this diamond
Prices start from $3,633 AUDSave up to $4,443 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
$3,633 AUD