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Round|Natural|GIA

1.20ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 2556151106

Certificate GIA 2556151106

Diamond specifications and retailer prices

From $2,888 AUD
As of November 6, 2026
Save $3,756 AUD (57%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $8,197 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2556151106. Listed at 19 retailers as of November 4, 2026, with a 130% 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 2556151106
Dimensions6.74 × 6.79 × 4.26 mm
L/W Ratio1.01
Top View
6.74 mm6.79 mm1.20 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2556151106
Side View
Table 57.0%Crown 36.5°Girdle: THN-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: $8,197 AUD|Low: $2,869 AUD|High: $8,225 AUD|Avg: $4,461 AUD|+3.0%
Queensmith
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 3$2,888 AUD
Retailer 2$3,007 AUD
Retailer 8$3,368 AUD
Retailer 12$3,509 AUD
Retailer 4$3,842 AUD
Retailer 11$3,886 AUD
Retailer 6$3,999 AUD
Retailer 10$4,007 AUD
Retailer 5$4,017 AUD
Retailer 7$4,711 AUD
Retailer 9$6,644 AUD
Queensmith$8,197 AUD

36 data points across 12 retailers

19 retailers$2,888 AUD to $6,644 AUD

A
Cheapest Retailer
-
$2,888 AUD
A
Retailer 2
-
$3,007 AUD
View
A
Retailer 3
-
$3,368 AUD
View
A
Retailer 4
-
$3,509 AUD
View
Final sale: no returns
A
Retailer 5
-
$3,577 AUD
View
Retailer 6
-
$3,842 AUD
View
Price last confirmed 39 days ago
Retailer 7
-
$3,842 AUD
View
Price last confirmed 21 days ago
Retailer 8
-
$3,842 AUD
View
Price last confirmed 17 days ago
A
Retailer 9
-
$3,886 AUD
View
Retailer 10
-
$3,989 AUD
View
Price last confirmed 38 days ago
A
Retailer 11
-
$3,999 AUD
View
B+
Retailer 12
-
$4,007 AUD
View
B+
Retailer 13
-
$4,017 AUD
View
Retailer 14
-
$4,433 AUD
View
Price last confirmed 38 days ago
B+
Retailer 15
-
$4,711 AUD
View
B
Retailer 16
-
$6,644 AUD
View
Retailer 17
-
$8,031 AUD
View
Price last confirmed 20 days ago
Retailer 18
-
$8,031 AUD
View
Price last confirmed 39 days ago
Most Expensive
Queensmith
2556151106 · Oct 28
$8,197 AUD
£4,435 GBP
View
Price last confirmed 9 days ago
18 more retailers have this diamond
Prices start from $2,888 AUDSave up to $3,756 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
$2,888 AUD