Marquise|Natural|GIA

1.20ct J SI1 Marquise Natural Diamond

ID • J/SI1 • GIA 7551009950

Certificate GIA 7551009950

Diamond specifications and retailer prices

From $3,615 USD
As of October 31, 2026
Save $3,969 USD (52%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $7,584 USD at MOH London · As of November 1, 2026
View at MOH London

About this 1.2ct natural marquise diamond

This 1.2ct natural marquise sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 7551009950. Listed at 18 retailers as of October 31, 2026, with prices from $3,615 to $7,584, a $3,969 spread on the same certified stone. MOH London lists it at $7,584. 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
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 7551009950
Dimensions10.45 × 5.51 × 3.48 mm
L/W Ratio1.90
Culet sizeNone
Key to symbols
Cloud, Crystal, Feather, Needle
Top View
10.45 mm5.51 mm1.20 ctJ / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 7551009950
Side View
Table 61.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 63.1%

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 31
Current: $7,584 USD|Low: $3,132 USD|High: $7,676 USD|Avg: $4,692 USD|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 1, 2026
Retailer 3$3,615 USD
Retailer 2$3,758 USD
Retailer 9$3,874 USD
Retailer 10$4,314 USD
Retailer 11$4,385 USD
Retailer 4$4,445 USD
Retailer 12$4,517 USD
Retailer 5$4,736 USD
Retailer 8$4,801 USD
Retailer 7$5,058 USD
Retailer 6$5,854 USD
MOH London$7,584 USD

43 data points across 12 retailers

18 retailers$3,615 USD to $7,584 USD

B+
Cheapest Retailer
-
$3,615 USD
B
Retailer 2
-
$3,721 USD
View
B+
Retailer 3
-
$3,758 USD
View
B
Retailer 4
-
$3,797 USD
View
B
Retailer 5
-
$3,805 USD
View
B
Retailer 6
-
$4,293 USD
View
Retailer 7
-
$4,314 USD
View
Price last confirmed 7 days ago
Retailer 8
-
$4,385 USD
View
Price last confirmed 11 days ago
B
Retailer 9
-
$4,445 USD
A$6,838 AUD
View
Retailer 10
-
$4,503 USD
View
Price last confirmed 9 days ago
B
Retailer 11
-
$4,517 USD
View
B
Retailer 12
-
$4,736 USD
£3,729 GBP
View
Retailer 13
-
$4,801 USD
A$7,386 AUD
View
Price last confirmed 23 days ago
B
Retailer 14
-
$4,951 USD
View
B
Retailer 15
-
$5,058 USD
€4,817 EUR
View
B
Retailer 16
-
$5,854 USD
ZAR 94,567 ZAR
View
Retailer 17
-
$6,890 USD
View
Price last confirmed 9 days ago
Most Expensive
B
MOH London
CBFC25F1D · Nov 1
$7,584 USD
£5,972 GBP
View
17 more retailers have this diamond
Prices start from $3,615 USDSave up to $3,969 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 Marquise
$3,615 USD