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Marquise|Natural|GIA

1.20ct I SI2 Marquise Natural Diamond

ID • I/SI2 • GIA 6541821320

Certificate GIA 6541821320

Diamond specifications and retailer prices

From £2,508 GBP
As of November 6, 2026
Save £3,478 GBP (58%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £5,986 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.2ct natural marquise diamond

This 1.2ct natural marquise sits in the classic one-carat band, graded I 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 6541821320. Listed at 22 retailers as of November 5, 2026, with prices from £2,508 to £5,986, a £3,478 spread on the same certified stone. NZ Jewellers lists it at £5,986. 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
I
Colour
SI2
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle38.17°
Pavilion angle41.24°
OriginNatural
Grading LabGIA
CertificateGIA 6541821320
Dimensions10.31 × 5.49 × 3.59 mm
L/W Ratio1.88
Top View
10.31 mm5.49 mm1.20 ctI / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6541821320
Side View
Table 57.0%Crown 38.17°Girdle: Slightly ThickPavilion 41.24°Culet: NoneDepth 65.3%

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: Nov 6
Current: £5,986 GBP|Low: £2,508 GBP|High: £5,986 GBP|Avg: £3,651 GBP
NZ Jewellers
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
Retailer 15
November 6, 2026
Retailer 10£2,508 GBP
Retailer 6£2,739 GBP
Retailer 11£2,787 GBP
Retailer 4£2,835 GBP
Retailer 5£2,873 GBP
Retailer 3£3,112 GBP
Retailer 14£3,112 GBP
Retailer 15£3,112 GBP
Retailer 7£3,178 GBP
Retailer 9£3,363 GBP
Retailer 2£3,378 GBP
Retailer 13£3,591 GBP
Retailer 8£3,866 GBP
Retailer 12£5,473 GBP
NZ Jewellers£5,986 GBP

34 data points across 15 retailers

22 retailers£2,508 GBP to £5,986 GBP

B+
Cheapest Retailer
-
£2,508 GBP
B+
Retailer 2
-
£2,739 GBP
View
B+
Retailer 3
-
£2,787 GBP
View
B+
Retailer 4
-
£2,835 GBP
View
B+
Retailer 5
-
£2,873 GBP
View
Final sale: no returns
B
Retailer 6
-
£3,101 GBP
View
Retailer 7
-
£3,112 GBP
View
Price last confirmed 9 days ago
B
Retailer 8
-
£3,112 GBP
View
B
Retailer 9
-
£3,112 GBP
View
Retailer 10
-
£3,112 GBP
View
Price last confirmed 30 days ago
B
Retailer 11
-
£3,178 GBP
View
B+
Retailer 12
-
£3,363 GBP
View
B
Retailer 13
-
£3,369 GBP
View
B
Retailer 14
-
£3,369 GBP
View
B+
Retailer 15
-
£3,378 GBP
View
B
Retailer 16
-
£3,482 GBP
View
B
Retailer 17
-
£3,591 GBP
View
Retailer 18
-
£3,591 GBP
View
Price last confirmed 24 days ago
B
Retailer 19
-
£3,866 GBP
View
Retailer 20
-
£3,885 GBP
View
Price last confirmed 23 days ago
B
Retailer 21
-
£5,473 GBP
View
Most Expensive
B
NZ Jewellers
fb7d9bd2-31bc-48ef-bd72-849a60980f7e · Nov 5
£5,986 GBP
$8,012 USD
View
21 more retailers have this diamond
Prices start from £2,508 GBPSave up to £3,478 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+
1.20ct Marquise
£2,508 GBP