Round|Natural|GIA

1.20ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 3515861893

Certificate GIA 3515861893

Diamond specifications and retailer prices

From $1,778 USD
As of November 6, 2026
Save $4,125 USD (70%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $7,706 USD at MOH London · As of November 2, 2026
View at MOH London

About this 1.2ct natural round diamond

This 1.2ct natural round sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 3515861893. Listed at 11 retailers as of November 5, 2026, with a 232% 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
J
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 3515861893
Dimensions6.72 × 6.77 × 4.24 mm
L/W Ratio1.01
Star length45%
Lower girdle80%
Top View
6.72 mm6.77 mm1.20 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 3515861893
Side View
Table 58.0%Crown 35.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.8%

Caratlytics Score

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

Price History

Last verified: Nov 6
Current: $7,706 USD|Low: $1,778 USD|High: $7,706 USD|Avg: $2,997 USD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 2$1,778 USD
Retailer 4$2,770 USD
Retailer 5$2,839 USD
Retailer 6$4,466 USD
Retailer 8$4,560 USD
Retailer 7$4,590 USD
Retailer 9$4,838 USD
Retailer 3$5,903 USD
MOH London$7,706 USD

41 data points across 9 retailers

11 retailers$1,778 USD to $5,903 USD

A
Cheapest Retailer
-
$1,778 USD
A
Retailer 2
-
$2,024 USD
View
B+
Retailer 3
-
$2,460 USD
View
B+
Retailer 4
-
$2,770 USD
View
B
Retailer 5
-
$2,839 USD
View
B
Retailer 6
-
$4,466 USD
View
Final sale: no returns
B
Retailer 7
-
$4,560 USD
View
B
Retailer 8
-
$4,590 USD
View
Retailer 9
-
$4,838 USD
View
Price last confirmed 8 days ago
C
Retailer 10
-
$5,903 USD
View
Most Expensive
MOH London
0BE670D94 · Nov 2
$7,706 USD
£6,068 GBP
View
Price under review
10 more retailers have this diamond
Prices start from $1,778 USDSave up to $4,125 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
$1,778 USD