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Marquise|Natural|GIA

1.21ct J SI2 Marquise Natural Diamond

EX • J/SI2 • GIA 2567109603

Certificate GIA 2567109603

Diamond specifications and retailer prices

From £1,896 GBP
As of November 6, 2026
Save £1,682 GBP (47%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,579 GBP at Helzberg Diamonds · As of November 6, 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 SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2567109603. Listed at 12 retailers as of November 6, 2026, with prices from £1,896 to £3,579, a £1,682 spread on the same certified stone. Helzberg Diamonds lists it at £3,579. 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
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle39.5°
Pavilion angle40.3°
OriginNatural
Grading LabGIA
CertificateGIA 2567109603
Dimensions10.51 × 5.54 × 3.55 mm
L/W Ratio1.90
Culet sizeNone
Top View
10.51 mm5.54 mm1.21 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2567109603
Side View
Table 58.0%Crown 39.5°Girdle: MED-THKPavilion 40.3°Culet: NoneDepth 64.0%

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: £3,579 GBP|Low: £1,896 GBP|High: £3,725 GBP|Avg: £2,511 GBP|-3.9%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 7, 2026
Retailer 5£1,896 GBP
Retailer 8£1,927 GBP
Retailer 10£2,046 GBP
Retailer 9£2,081 GBP
Retailer 2£2,217 GBP
Retailer 3£2,265 GBP
Retailer 11£2,431 GBP
Retailer 7£2,501 GBP
Retailer 12£2,507 GBP
Retailer 6£2,611 GBP
Retailer 4£3,363 GBP
Helzberg Diamonds£3,579 GBP

34 data points across 12 retailers

12 retailers£1,896 GBP to £3,579 GBP

A
Cheapest Retailer
-
£1,896 GBP
B+
Retailer 2
-
£1,927 GBP
View
B+
Retailer 3
-
£2,046 GBP
View
B+
Retailer 4
-
£2,081 GBP
View
B+
Retailer 5
-
£2,217 GBP
View
B+
Retailer 6
-
£2,265 GBP
View
B
Retailer 7
-
£2,431 GBP
View
B
Retailer 8
-
£2,501 GBP
View
B
Retailer 9
-
£2,507 GBP
View
B+
Retailer 10
-
£2,611 GBP
View
B
Retailer 11
-
£3,363 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRILMNHGPMGJ · Nov 6
£3,579 GBP
$4,790 USD
View
11 more retailers have this diamond
Prices start from £1,896 GBPSave up to £1,682 GBP

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
1.21ct Marquise
£1,896 GBP