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Marquise|Natural|GIA

1.20ct D SI1 Marquise Natural Diamond

EX • D/SI1 • GIA 2566258812

Certificate GIA 2566258812

Diamond specifications and retailer prices

From £3,414 GBP
As of November 6, 2026
Save £3,280 GBP (49%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £7,721 GBP at NZ Jewellers · As of October 17, 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 D 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 2566258812. Listed at 19 retailers as of November 4, 2026, with a 96% 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
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2566258812
Dimensions10.66 × 5.52 × 3.50 mm
L/W Ratio1.93
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Indented Natural
Top View
10.66 mm5.52 mm1.20 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 2566258812
Side View
Table 59.0%CrownGirdle: THN-THKPavilionCulet: NoneDepth 63.5%

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: £4,419 GBP|Low: £3,385 GBP|High: £6,882 GBP|Avg: £4,842 GBP|-3.0%
Retailer 1
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
November 6, 2026
Retailer 12£3,414 GBP
Retailer 13£3,762 GBP
Retailer 3£3,895 GBP
Retailer 9£4,074 GBP
Retailer 4£4,205 GBP
Retailer 6£4,214 GBP
Retailer 7£4,328 GBP
Retailer 1£4,419 GBP
Retailer 5£4,587 GBP
Retailer 2£4,672 GBP
Retailer 11£4,956 GBP
Retailer 8£5,558 GBP
Retailer 14£6,328 GBP
Retailer 10£6,693 GBP

38 data points across 14 retailers

19 retailers£3,414 GBP to £6,693 GBP

B+
Cheapest Retailer
-
£3,414 GBP
B+
Retailer 2
-
£3,762 GBP
View
Retailer 3
-
£3,895 GBP
View
Price last confirmed 11 days ago
B+
Retailer 4
-
£4,074 GBP
View
B+
Retailer 5
-
£4,205 GBP
View
Final sale: no returns
B+
Retailer 6
-
£4,214 GBP
View
B+
Retailer 7
-
£4,328 GBP
View
B+
Retailer 8
-
£4,419 GBP
View
Retailer 9
-
£4,587 GBP
View
Price last confirmed 34 days ago
Retailer 10
-
£4,616 GBP
View
Price last confirmed 21 days ago
Retailer 11
-
£4,616 GBP
View
Price last confirmed 22 days ago
Retailer 12
-
£4,616 GBP
View
Price last confirmed 20 days ago
B
Retailer 13
-
£4,672 GBP
View
B
Retailer 14
-
£4,956 GBP
View
Retailer 15
-
£5,326 GBP
View
Price last confirmed 19 days ago
B
Retailer 16
-
£5,558 GBP
View
Retailer 17
-
£6,328 GBP
View
Price last confirmed 10 days ago
B
Retailer 18
-
£6,693 GBP
View
Most Expensive
NZ Jewellers
fd206e61-88f7-4d07-bbc1-3efa3b71bb88 · Oct 17
£7,721 GBP
$10,334 USD
View
Price last confirmed 20 days ago
18 more retailers have this diamond
Prices start from £3,414 GBPSave up to £3,280 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
£3,414 GBP