Round|Natural|GIA

1.20ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 6521501206

Certificate GIA 6521501206

Diamond specifications and retailer prices

From $8,142 AUD
$5,719 USD
As of October 30, 2026
Save $5,353 AUD (40%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $15,614 AUD at NZ Jewellers · As of October 17, 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 6521501206. Listed at 18 retailers as of October 29, 2026, with a 66% 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 6521501206
Dimensions6.76 × 6.80 × 4.26 mm
L/W Ratio1.01
Star length45%
Lower girdle75%
Top View
6.76 mm6.80 mm1.20 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6521501206
Side View
Table 56.0%Crown 35°Girdle: THN-STKPavilion 41.4°CuletDepth 62.8%

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: Oct 30
Current: $11,470 AUD|Low: $8,142 AUD|High: $13,585 AUD|Avg: $9,704 AUD|+2.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 7$8,142 AUD
Retailer 2$8,228 AUD
Retailer 10$8,617 AUD
Retailer 9$8,670 AUD
Retailer 4$8,793 AUD
Retailer 5$8,894 AUD
Retailer 8$9,107 AUD
Retailer 3$10,202 AUD
Retailer 1$11,470 AUD
Retailer 6$13,495 AUD

42 data points across 10 retailers

18 retailers$8,142 AUD to $13,495 AUD

B+
Cheapest Retailer
-
$8,142 AUD
$5,719 USD
B+
Retailer 2
-
$8,228 AUD
$5,780 USD
View
Retailer 3
-
$8,617 AUD
$6,053 USD
View
Price last confirmed 16 days ago
B
Retailer 4
-
$8,670 AUD
$6,090 USD
View
B+
Retailer 5
-
$8,793 AUD
£4,863 GBP
View
B+
Retailer 6
-
$8,894 AUD
£4,919 GBP
View
Retailer 7
-
$9,107 AUD
View
Price last confirmed 22 days ago
Retailer 8
-
$9,335 AUD
$6,557 USD
View
Price last confirmed 39 days ago
Retailer 9
-
$9,335 AUD
$6,557 USD
View
Price last confirmed 14 days ago
Retailer 10
-
$9,478 AUD
$6,658 USD
View
Price last confirmed 16 days ago
B
Retailer 11
-
$9,561 AUD
$6,716 USD
View
B
Retailer 12
-
$10,202 AUD
€6,825 EUR
View
Retailer 13
-
$10,771 AUD
$7,566 USD
View
Price last confirmed 40 days ago
Retailer 14
-
$10,771 AUD
$7,566 USD
View
Price last confirmed 13 days ago
B
Retailer 15
-
$11,470 AUD
ZAR 130,158 ZAR
View
B
Retailer 16
-
$13,495 AUD
£7,464 GBP
View
Retailer 17
-
$15,614 AUD
$10,968 USD
View
Price last confirmed 36 days ago
Most Expensive
NZ Jewellers
ff94d009-ce99-4fd1-aa99-fb89a8136b35 · Oct 17
$15,614 AUD
$10,968 USD
View
Price last confirmed 14 days ago
17 more retailers have this diamond
Prices start from $8,142 AUDSave up to $5,353 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
$8,142 AUD