Round|Natural|GIA

1.20ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1563043428

Certificate GIA 1563043428

Diamond specifications and retailer prices

From $3,084 AUD
$2,166 USD
As of October 25, 2026
Save $987 AUD (24%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $5,682 AUD at Helzberg Diamonds · As of October 25, 2026
View at Helzberg Diamonds

About this 1.2ct natural round diamond

This 1.2ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1563043428. Listed at 14 retailers as of October 25, 2026, with a 32% 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 1563043428
Dimensions6.77 × 6.79 × 4.23 mm
L/W Ratio1.00
Culet sizeNone
Top View
6.77 mm6.79 mm1.20 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1563043428
Side View
Table 57.0%Crown 36.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.3%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 25
Current: $5,682 AUD|Low: $2,918 AUD|High: $5,973 AUD|Avg: $3,971 AUD|-3.8%
Helzberg Diamonds
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
October 26, 2026
Retailer 13$2,918 AUD
Retailer 11$3,084 AUD
Retailer 9$3,142 AUD
Retailer 12$3,169 AUD
Retailer 8$3,175 AUD
Retailer 7$3,329 AUD
Retailer 5$3,449 AUD
Retailer 14$3,745 AUD
Retailer 4$3,945 AUD
Retailer 10$3,968 AUD
Retailer 2$4,070 AUD
Retailer 6$4,830 AUD
Retailer 3$5,202 AUD
Helzberg Diamonds$5,682 AUD

28 data points across 14 retailers

14 retailers$3,084 AUD to $4,070 AUD

Retailer 1
-
$2,918 AUD
SGD 2,770 SGD
Price last confirmed 8 days ago
A
Retailer 2
-
$3,084 AUD
$2,166 USD
View
Retailer 3
-
$3,142 AUD
$2,207 USD
View
Price last confirmed 8 days ago
Retailer 4
-
$3,169 AUD
$2,226 USD
View
Price last confirmed 8 days ago
Retailer 5
-
$3,175 AUD
$2,230 USD
View
Price last confirmed 7 days ago
A
Retailer 6
-
$3,329 AUD
£1,841 GBP
View
A
Retailer 7
-
$3,449 AUD
SGD 3,274 SGD
View
Retailer 8
-
$3,745 AUD
$2,631 USD
View
Price last confirmed 8 days ago
Retailer 9
-
$3,945 AUD
$2,771 USD
View
Price last confirmed 8 days ago
A
Retailer 10
-
$3,968 AUD
£2,195 GBP
View
A
Retailer 11
-
$4,070 AUD
€2,723 EUR
View
Retailer 12
-
$4,830 AUD
$3,393 USD
View
Price last confirmed 8 days ago
Retailer 13
-
$5,202 AUD
$3,654 USD
View
Price last confirmed 9 days ago
Most Expensive
Helzberg Diamonds
XZRHLMJGKJKIO · Oct 25
$5,682 AUD
$3,991 USD
View
Price last confirmed 7 days ago
13 more retailers have this diamond
Prices start from $3,084 AUDSave up to $987 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
$3,084 AUD