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Round|Natural|GIA

1.20ct D SI1 Round Natural Diamond

ID • D/SI1 • GIA 671

Certificate GIA 671

Diamond specifications and retailer prices

From $4,400 AUD
As of November 4, 2026
Save $7,942 AUD (64%) vs most expensive(unlock to see where)
28 retailers carry this diamond
Most expensive: $13,997 AUD at NZ Jewellers · As of September 24, 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at 28 retailers as of November 4, 2026, with a 181% 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
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 671
Dimensions6.71 × 6.76 × 4.24 mm
L/W Ratio1.01
Top View
6.71 mm6.76 mm1.20 ctD / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 671
Side View
Table 56.0%CrownGirdle: Thin to Slightly ThickPavilionCulet: NDepth 62.9%

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: Nov 4
Current: $12,342 AUD|Low: $4,780 AUD|High: $12,564 AUD|Avg: $7,556 AUD|-1.8%
NZ Jewellers
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
November 6, 2026
Retailer 14$5,197 AUD
Retailer 11$5,944 AUD
Retailer 6$6,204 AUD
Retailer 7$6,609 AUD
Retailer 2$6,778 AUD
Retailer 13$6,803 AUD
Retailer 3$6,942 AUD
Retailer 9$7,083 AUD
Retailer 12$7,083 AUD
Retailer 8$7,818 AUD
Retailer 4$8,236 AUD
Retailer 5$8,367 AUD
Retailer 10$11,252 AUD
NZ Jewellers$12,342 AUD

29 data points across 14 retailers

28 retailers$4,400 AUD to $12,342 AUD

A
Cheapest Retailer
-
$4,400 AUD
A
Retailer 2
-
$4,766 AUD
View
A
Retailer 3
-
$5,197 AUD
View
B+
Retailer 4
-
$5,631 AUD
View
B+
Retailer 5
-
$5,944 AUD
View
Retailer 6
-
$6,031 AUD
View
Price last confirmed 15 days ago
B+
Retailer 7
-
$6,204 AUD
View
B+
Retailer 8
-
$6,609 AUD
View
Retailer 9
-
$6,730 AUD
View
Price last confirmed 10 days ago
B+
Retailer 10
-
$6,778 AUD
View
B+
Retailer 11
-
$6,803 AUD
View
B+
Retailer 12
-
$6,942 AUD
View
B+
Retailer 13
-
$7,083 AUD
View
B+
Retailer 14
-
$7,083 AUD
View
Retailer 15
-
$7,212 AUD
View
Price last confirmed 15 days ago
B+
Retailer 16
-
$7,818 AUD
View
B+
Retailer 17
-
$8,236 AUD
View
B+
Retailer 18
-
$8,367 AUD
View
Retailer 19
-
$8,369 AUD
View
Price last confirmed 60 days ago
Retailer 20
-
$8,369 AUD
View
Price last confirmed 50 days ago
Retailer 21
-
$8,369 AUD
View
Price last confirmed 50 days ago
Retailer 22
-
$8,369 AUD
View
Price last confirmed 45 days ago
Retailer 23
-
$8,369 AUD
View
Price last confirmed 44 days ago
B
Retailer 24
-
$11,252 AUD
View
B
Retailer 25
-
$11,336 AUD
View
B
Retailer 26
-
$12,342 AUD
View
Retailer 27
-
$13,997 AUD
View
Price last confirmed 49 days ago
Most Expensive
NZ Jewellers
d0f9916a-4647-440b-a993-8f6e9e83742b · Sep 24
$13,997 AUD
$9,617 USD
View
Price last confirmed 43 days ago
27 more retailers have this diamond
Prices start from $4,400 AUDSave up to $7,942 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
$4,400 AUD