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Marquise|Natural|GIA

1.21ct H SI1 Marquise Natural Diamond

ID • H/SI1 • GIA 1558990218

Certificate GIA 1558990218

Diamond specifications and retailer prices

From £3,765 GBP
As of November 5, 2026
Save £578 GBP (13%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £4,343 GBP at Diamonds Direct · As of November 6, 2026
View at Diamonds Direct

About this 1.21ct natural marquise diamond

This 1.21ct natural marquise sits in the classic one-carat band, graded H 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 1558990218. Listed at 2 retailers as of November 5, 2026, with prices from £3,765 to £4,343, a £578 spread on the same certified stone. Diamonds Direct lists it at £4,343. 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
H
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1558990218
Dimensions10.08 × 5.51 × 3.63 mm
L/W Ratio1.83
Top View
10.08 mm5.51 mm1.21 ctH / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1558990218
Side View
Table 64.0%CrownGirdlePavilionCuletDepth 65.7%

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: £4,343 GBP|Low: £3,765 GBP|High: £4,850 GBP|Avg: £4,218 GBP|-10.5%
Diamonds Direct
Retailer 2
November 6, 2026
Retailer 2£3,765 GBP
Diamonds Direct£4,343 GBP

11 data points across 2 retailers

2 retailers£3,765 GBP to £4,343 GBP

B
Cheapest Retailer
-
£3,765 GBP
Most Expensive
B
Diamonds Direct
1101320 · Nov 6
£4,343 GBP
$5,813 USD
View
1 more retailer has this diamond
Prices start from £3,765 GBPSave up to £578 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.

B
1.21ct Marquise
£3,765 GBP