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Marquise|Natural|GIA

1.21ct E SI1 Marquise Natural Diamond

ID • E/SI1 • GIA 2566660461

Certificate GIA 2566660461

Diamond specifications and retailer prices

From £4,510 GBP
$6,070 USD
As of November 5, 2026
1 retailer carries this diamond
Only listing: £4,510 GBP at Brilliant Earth
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Brilliant Earth

About this 1.21ct natural marquise diamond

This 1.21ct natural marquise sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2566660461. Listed at a single retailer as of November 5, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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
E
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2566660461
Dimensions10.41 × 5.55 × 3.38 mm
L/W Ratio1.88
Top View
10.41 mm5.55 mm1.21 ctE / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2566660461
Side View
Table 59.0%CrownGirdle: Very ThickPavilionCulet: NoneDepth 60.8%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 5
Current: £4,510 GBP|Low: £4,510 GBP|High: £4,532 GBP|Avg: £4,521 GBP|-0.5%
October 26, 2026
Brilliant Earth£4,510 GBP

2 data points across 1 retailer

1 retailer

B
Brilliant Earth
22205487A · Nov 5
£4,510 GBP
$6,070 USD
View

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
£4,510 GBP