Round|Natural|GIA

1.20ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1548587129

Certificate GIA 1548587129

Diamond specifications and retailer prices

From $4,307 AUD
As of November 4, 2026
Save $3,793 AUD (47%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $9,767 AUD at NZ Jewellers · As of October 20, 2026
View at NZ Jewellers

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 1548587129. Listed at 22 retailers as of November 4, 2026, with a 88% 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
SymmetryExcellent
FluorescenceMedium
Crown angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1548587129
Dimensions6.78 × 6.75 × 4.22 mm
L/W Ratio1.00
Girdle conditionSlightly Thick
Key to symbols
Crystal, Feather, Needle
Top View
6.78 mm6.75 mm1.20 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1548587129
Side View
Table 58.0%Crown 35.5°Girdle: Slightly ThickPavilion 41°Culet: NoneDepth 62.4%

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 4
Current: $6,332 AUD|Low: $4,307 AUD|High: $9,486 AUD|Avg: $5,967 AUD|+13.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 3$4,307 AUD
Retailer 8$4,339 AUD
Retailer 7$4,455 AUD
Retailer 6$6,004 AUD
Retailer 2$6,129 AUD
Retailer 1$6,332 AUD
Retailer 5$6,804 AUD
Retailer 4$9,424 AUD

41 data points across 8 retailers

22 retailers$4,307 AUD to $8,099 AUD

B+
Cheapest Retailer
-
$4,307 AUD
B+
Retailer 2
-
$4,339 AUD
View
B+
Retailer 3
-
$4,381 AUD
View
B+
Retailer 4
-
$4,455 AUD
View
Final sale: no returns
Retailer 5
-
$4,507 AUD
View
Price last confirmed 18 days ago
B+
Retailer 6
-
$4,823 AUD
View
Retailer 7
-
$4,890 AUD
View
Price last confirmed 16 days ago
Retailer 8
-
$5,079 AUD
View
Price last confirmed 22 days ago
Retailer 9
-
$5,079 AUD
View
Price last confirmed 18 days ago
Retailer 10
-
$5,274 AUD
View
Price last confirmed 23 days ago
B
Retailer 11
-
$5,522 AUD
View
B
Retailer 12
-
$5,522 AUD
View
Retailer 13
-
$5,859 AUD
View
Price last confirmed 17 days ago
Retailer 14
-
$6,004 AUD
View
Price last confirmed 30 days ago
B+
Retailer 15
-
$6,129 AUD
View
B
Retailer 16
-
$6,332 AUD
View
Retailer 17
-
$6,346 AUD
View
Price last confirmed 23 days ago
B
Retailer 18
-
$6,590 AUD
View
Retailer 19
-
$6,804 AUD
View
Price last confirmed 21 days ago
B
Retailer 20
-
$8,099 AUD
View
Retailer 21
-
$9,424 AUD
View
Price last confirmed 17 days ago
Most Expensive
NZ Jewellers
0a40bb14-684d-41c6-873e-4e48ee2e3721 · Oct 20
$9,767 AUD
$6,711 USD
View
Price last confirmed 17 days ago
21 more retailers have this diamond
Prices start from $4,307 AUDSave up to $3,793 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 Round
$4,307 AUD