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Marquise|Natural|GIA

1.21ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 5241045555

Certificate GIA 5241045555

Diamond specifications and retailer prices

From €2,545 EUR
As of October 31, 2026
Save €2,199 EUR (46%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: €4,743 EUR at Helzberg Diamonds · As of November 3, 2026
View at Helzberg Diamonds

About this 1.21ct natural marquise diamond

This 1.21ct 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 5241045555. Listed at 14 retailers as of October 31, 2026, with prices from €2,545 to €4,743, a €2,199 spread on the same certified stone. Helzberg Diamonds lists it at €4,743. 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

1.21
Carat
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryExcellent
FluorescenceFaint
Crown angle39.63°
Pavilion angle40.08°
OriginNatural
Grading LabGIA
CertificateGIA 5241045555
Dimensions11.24 × 5.28 × 3.40 mm
L/W Ratio2.13
Culet sizeNone
Top View
11.24 mm5.28 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceFaint
CertificateGIA 5241045555
Side View
Table 59.0%Crown 39.63°Girdle: STK-THKPavilion 40.08°Culet: NDepth 64.3%

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: €4,743 EUR|Low: €2,545 EUR|High: €5,144 EUR|Avg: €3,379 EUR|-7.8%
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
November 5, 2026
Retailer 3€2,545 EUR
Retailer 2€2,606 EUR
Retailer 13€2,684 EUR
Retailer 8€2,696 EUR
Retailer 14€2,743 EUR
Retailer 12€2,916 EUR
Retailer 11€3,005 EUR
Retailer 9€3,206 EUR
Retailer 5€3,251 EUR
Retailer 10€3,280 EUR
Retailer 7€3,324 EUR
Retailer 6€4,292 EUR
Retailer 4€4,551 EUR
Helzberg Diamonds€4,743 EUR

35 data points across 14 retailers

14 retailers€2,545 EUR to €4,743 EUR

B+
Cheapest Retailer
-
€2,545 EUR
B+
Retailer 2
-
€2,606 EUR
View
B+
Retailer 3
-
€2,684 EUR
View
B+
Retailer 4
-
€2,696 EUR
View
B+
Retailer 5
-
€2,743 EUR
View
B
Retailer 6
-
€2,916 EUR
View
B
Retailer 7
-
€3,005 EUR
View
B
Retailer 8
-
€3,206 EUR
View
B
Retailer 9
-
€3,251 EUR
View
B
Retailer 10
-
€3,280 EUR
View
B
Retailer 11
-
€3,324 EUR
View
B
Retailer 12
-
€4,292 EUR
View
Retailer 13
-
€4,551 EUR
View
Price last confirmed 11 days ago
Most Expensive
B
Helzberg Diamonds
XZRLIKHGKLLLL · Nov 3
€4,743 EUR
$5,296 USD
View
13 more retailers have this diamond
Prices start from €2,545 EURSave up to €2,199 EUR

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+
1.21ct Marquise
€2,545 EUR