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Marquise|Natural|GIA

1.20ct G SI1 Marquise Natural Diamond

ID • G/SI1 • GIA 6545625677

Certificate GIA 6545625677

Diamond specifications and retailer prices

From £4,880 GBP
As of November 6, 2026
Save £2,953 GBP (38%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £9,710 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 G 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 6545625677. Listed at 12 retailers as of November 4, 2026, with a 61% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
G
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6545625677
Dimensions11.89 × 5.23 × 3.31 mm
L/W Ratio2.27
Top View
11.89 mm5.23 mm1.20 ctG / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6545625677
Side View
Table 59.0%CrownGirdle: ThickPavilionCulet: NoneDepth 63.3%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £9,710 GBP|Low: £4,818 GBP|High: £9,710 GBP|Avg: £6,047 GBP|+1.7%
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
November 6, 2026
Retailer 6£4,880 GBP
Retailer 5£4,989 GBP
Retailer 2£5,018 GBP
Retailer 11£5,327 GBP
Retailer 9£5,420 GBP
Retailer 7£5,496 GBP
Retailer 4£5,547 GBP
Retailer 8£5,772 GBP
Retailer 13£5,864 GBP
Retailer 3£6,294 GBP
Retailer 10£7,083 GBP
Retailer 12£7,833 GBP
NZ Jewellers£9,710 GBP

15 data points across 13 retailers

12 retailers£4,880 GBP to £7,833 GBP

B
Cheapest Retailer
-
£4,880 GBP
B
Retailer 2
-
£5,018 GBP
View
B
Retailer 3
-
£5,327 GBP
View
B
Retailer 4
-
£5,420 GBP
View
B
Retailer 5
-
£5,496 GBP
View
Retailer 6
-
£5,547 GBP
View
Price last confirmed 34 days ago
B
Retailer 7
-
£5,772 GBP
View
B
Retailer 8
-
£5,864 GBP
View
B
Retailer 9
-
£6,294 GBP
View
B
Retailer 10
-
£7,083 GBP
View
B
Retailer 11
-
£7,833 GBP
View
Most Expensive
NZ Jewellers
7c049642-ce40-4b7b-9fc2-ef4b83bc0466 · Nov 5
£9,710 GBP
$12,997 USD
View
Price under review
11 more retailers have this diamond
Prices start from £4,880 GBPSave up to £2,953 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
£4,880 GBP