Round|Natural|GIA

1.20ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1563043428

Certificate GIA 1563043428

Diamond specifications and retailer prices

From $2,166 USD
As of October 25, 2026
Save $1,825 USD (46%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $3,991 USD 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 prices from $2,166 to $3,991, a $1,825 spread on the same certified stone. Helzberg Diamonds lists it at $3,991. 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
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: $3,991 USD|Low: $2,050 USD|High: $4,196 USD|Avg: $2,790 USD|-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$2,050 USD
Retailer 11$2,166 USD
Retailer 9$2,207 USD
Retailer 12$2,226 USD
Retailer 8$2,230 USD
Retailer 7$2,339 USD
Retailer 5$2,423 USD
Retailer 14$2,631 USD
Retailer 4$2,771 USD
Retailer 10$2,788 USD
Retailer 2$2,859 USD
Retailer 6$3,393 USD
Retailer 3$3,654 USD
Helzberg Diamonds$3,991 USD

28 data points across 14 retailers

14 retailers$2,166 USD to $3,991 USD

Retailer 1
-
$2,050 USD
SGD 2,770 SGD
Price last confirmed 7 days ago
A
Retailer 2
-
$2,166 USD
View
A
Retailer 3
-
$2,207 USD
View
Retailer 4
-
$2,226 USD
View
Price last confirmed 7 days ago
A
Retailer 5
-
$2,230 USD
View
A
Retailer 6
-
$2,339 USD
£1,841 GBP
View
A
Retailer 7
-
$2,423 USD
SGD 3,274 SGD
View
Retailer 8
-
$2,631 USD
View
Price last confirmed 7 days ago
Retailer 9
-
$2,771 USD
View
Price last confirmed 7 days ago
A
Retailer 10
-
$2,788 USD
£2,195 GBP
View
A
Retailer 11
-
$2,859 USD
€2,723 EUR
View
B+
Retailer 12
-
$3,393 USD
View
Retailer 13
-
$3,654 USD
View
Price last confirmed 8 days ago
Most Expensive
B+
Helzberg Diamonds
XZRHLMJGKJKIO · Oct 25
$3,991 USD
View
13 more retailers have this diamond
Prices start from $2,166 USDSave up to $1,825 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.

A
1.20ct Round
$2,166 USD