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Marquise|Natural|GIA

1.20ct I SI1 Marquise Natural Diamond

EX • I/SI1 • GIA 1565306355

Certificate GIA 1565306355

Diamond specifications and retailer prices

From £2,634 GBP
As of November 6, 2026
Save £3,523 GBP (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £6,158 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 SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1565306355. Listed at 20 retailers as of November 5, 2026, with prices from £2,634 to £6,158, a £3,523 spread on the same certified stone. NZ Jewellers lists it at £6,158. 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
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1565306355
Dimensions11.23 × 5.42 × 3.04 mm
L/W Ratio2.07
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather
Top View
11.23 mm5.42 mm1.20 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 1565306355
Side View
Table 60.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 56.0%

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: £2,634 GBP|Low: £2,634 GBP|High: £5,688 GBP|Avg: £3,753 GBP|-3.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 1£2,634 GBP
Retailer 2£3,336 GBP
Retailer 4£3,428 GBP
Retailer 6£3,459 GBP
Retailer 9£3,544 GBP
Retailer 3£3,563 GBP
Retailer 11£3,571 GBP
Retailer 10£3,722 GBP
Retailer 5£3,753 GBP
Retailer 7£4,312 GBP
Retailer 8£5,614 GBP

30 data points across 11 retailers

20 retailers£2,634 GBP to £6,158 GBP

B+
Cheapest Retailer
-
£2,634 GBP
B+
Retailer 2
-
£2,813 GBP
View
Final sale: no returns
B
Retailer 3
-
£3,083 GBP
View
B+
Retailer 4
-
£3,231 GBP
View
B
Retailer 5
-
£3,336 GBP
View
B+
Retailer 6
-
£3,428 GBP
View
B+
Retailer 7
-
£3,459 GBP
View
Retailer 8
-
£3,535 GBP
View
Price last confirmed 9 days ago
B
Retailer 9
-
£3,535 GBP
View
B
Retailer 10
-
£3,535 GBP
View
B
Retailer 11
-
£3,544 GBP
View
Retailer 12
-
£3,563 GBP
View
Price last confirmed 29 days ago
B
Retailer 13
-
£3,571 GBP
View
B
Retailer 14
-
£3,678 GBP
View
B
Retailer 15
-
£3,722 GBP
View
B
Retailer 16
-
£3,753 GBP
View
B
Retailer 17
-
£4,078 GBP
View
B
Retailer 18
-
£4,312 GBP
View
B
Retailer 19
-
£5,614 GBP
View
Most Expensive
B
NZ Jewellers
a8ee4bc2-c613-4e2c-a18c-d585237df2a4 · Nov 5
£6,158 GBP
$8,242 USD
View
19 more retailers have this diamond
Prices start from £2,634 GBPSave up to £3,523 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
£2,634 GBP