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Marquise|Natural|GIA

1.20ct D SI1 Marquise Natural Diamond

EX • D/SI1 • GIA 6555380367

Certificate GIA 6555380367

Diamond specifications and retailer prices

From £3,720 GBP
As of November 6, 2026
Save £4,655 GBP (56%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £8,375 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 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 6555380367. Listed at 18 retailers as of November 5, 2026, with prices from £3,720 to £8,375, a £4,655 spread on the same certified stone. NZ Jewellers lists it at £8,375. 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
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 6555380367
Dimensions11.02 × 5.41 × 3.46 mm
L/W Ratio2.04
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Needle, Indented Natural
Top View
11.02 mm5.41 mm1.20 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 6555380367
Side View
Table 57.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 63.9%

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: £5,440 GBP|Low: £3,682 GBP|High: £7,466 GBP|Avg: £5,281 GBP|+2.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 5£3,720 GBP
Retailer 7£4,622 GBP
Retailer 2£4,755 GBP
Retailer 6£4,887 GBP
Retailer 1£5,440 GBP
Retailer 3£6,110 GBP
Retailer 4£7,358 GBP

45 data points across 7 retailers

18 retailers£3,720 GBP to £8,375 GBP

B+
Cheapest Retailer
-
£3,720 GBP
B+
Retailer 2
-
£4,237 GBP
View
Retailer 3
-
£4,240 GBP
View
Price last confirmed 24 days ago
B+
Retailer 4
-
£4,367 GBP
View
B
Retailer 5
-
£4,622 GBP
View
Final sale: no returns
Retailer 6
-
£4,622 GBP
View
Price last confirmed 9 days ago
B
Retailer 7
-
£4,647 GBP
View
B+
Retailer 8
-
£4,755 GBP
View
Retailer 9
-
£4,887 GBP
View
Price last confirmed 26 days ago
B
Retailer 10
-
£5,008 GBP
View
B
Retailer 11
-
£5,085 GBP
View
B
Retailer 12
-
£5,126 GBP
View
B
Retailer 13
-
£5,440 GBP
View
Retailer 14
-
£5,778 GBP
View
Price last confirmed 62 days ago
B
Retailer 15
-
£5,778 GBP
View
B
Retailer 16
-
£6,110 GBP
View
B
Retailer 17
-
£7,358 GBP
View
Most Expensive
B
NZ Jewellers
0bcfb9a2-8027-4021-b8ae-6ab190999d2e · Nov 5
£8,375 GBP
$11,210 USD
View
17 more retailers have this diamond
Prices start from £3,720 GBPSave up to £4,655 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
£3,720 GBP