Round|Natural|GIA

1.20ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1328547279

Certificate GIA 1328547279

Diamond specifications and retailer prices

From $3,405 USD
As of October 30, 2026
Save $4,187 USD (55%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $7,592 USD at NZ Jewellers · As of October 30, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1328547279. Listed at 21 retailers as of October 30, 2026, with prices from $3,405 to $7,592, a $4,187 spread on the same certified stone. NZ Jewellers lists it at $7,592. 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
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 1328547279
Dimensions6.77 × 6.72 × 4.22 mm
L/W Ratio1.01
Culet sizeNone
Top View
6.77 mm6.72 mm1.20 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1328547279
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.8%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $4,430 USD|Low: $3,274 USD|High: $7,296 USD|Avg: $4,555 USD|-1.4%
Retailer 1
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
Retailer 15
Retailer 16
October 30, 2026
Retailer 12$3,405 USD
Retailer 14$3,405 USD
Retailer 3$3,474 USD
Retailer 4$3,643 USD
Retailer 16$3,770 USD
Retailer 15$3,939 USD
Retailer 7$3,948 USD
Retailer 5$4,400 USD
Retailer 13$4,400 USD
Retailer 1$4,430 USD
Retailer 6$4,550 USD
Retailer 8$4,563 USD
Retailer 9$4,663 USD
Retailer 2$4,929 USD
Retailer 11$5,307 USD
Retailer 10$6,977 USD

40 data points across 16 retailers

21 retailers$3,405 USD to $7,592 USD

Retailer 1
-
$3,405 USD
Price last confirmed 9 days ago
B+
Retailer 2
-
$3,405 USD
View
B+
Retailer 3
-
$3,474 USD
View
B+
Retailer 4
-
$3,615 USD
A$5,561 AUD
View
B+
Retailer 5
-
$3,643 USD
View
Final sale: no returns
B
Retailer 6
-
$3,770 USD
View
B+
Retailer 7
-
$3,939 USD
View
B+
Retailer 8
-
$3,948 USD
View
B+
Retailer 9
-
$3,948 USD
View
B+
Retailer 10
-
$3,948 USD
View
B
Retailer 11
-
$4,400 USD
View
B
Retailer 12
-
$4,400 USD
View
B+
Retailer 13
-
$4,430 USD
£3,488 GBP
View
B
Retailer 14
-
$4,550 USD
View
B
Retailer 15
-
$4,555 USD
View
Retailer 16
-
$4,563 USD
A$7,020 AUD
View
Price last confirmed 21 days ago
B
Retailer 17
-
$4,663 USD
€4,441 EUR
View
Retailer 18
-
$4,929 USD
View
Price last confirmed 7 days ago
B
Retailer 19
-
$5,307 USD
ZAR 85,728 ZAR
View
B
Retailer 20
-
$6,977 USD
£5,494 GBP
View
Most Expensive
B
NZ Jewellers
ab56c08d-b5e9-43cc-b4c1-58d99346cb36 · Oct 30
$7,592 USD
View
20 more retailers have this diamond
Prices start from $3,405 USDSave up to $4,187 USD

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
$3,405 USD