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Marquise|Natural|GIA

1.20ct D SI2 Marquise Natural Diamond

EX • D/SI2 • GIA 3555937032

Certificate GIA 3555937032

Diamond specifications and retailer prices

From £2,740 GBP
As of November 4, 2026
Save £2,170 GBP (44%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £4,909 GBP at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.2ct natural marquise diamond

This 1.2ct natural marquise sits in the classic one-carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 3555937032. Listed at 11 retailers as of November 4, 2026, with prices from £2,740 to £4,909, a £2,170 spread on the same certified stone. Helzberg Diamonds lists it at £4,909. 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
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle38.76°
Pavilion angle40.92°
OriginNatural
Grading LabGIA
CertificateGIA 3555937032
Dimensions10.44 × 5.50 × 3.54 mm
L/W Ratio1.90
Culet sizeNone
Top View
10.44 mm5.50 mm1.20 ctD / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 3555937032
Side View
Table 57.0%Crown 38.76°Girdle: THN-THKPavilion 40.92°Culet: NoneDepth 64.3%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £4,909 GBP|Low: £2,740 GBP|High: £5,216 GBP|Avg: £3,528 GBP|-5.9%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 7£2,740 GBP
Retailer 6£2,763 GBP
Retailer 5£2,806 GBP
Retailer 8£2,928 GBP
Retailer 11£2,991 GBP
Retailer 4£3,142 GBP
Retailer 9£3,470 GBP
Retailer 10£3,496 GBP
Retailer 2£3,522 GBP
Retailer 3£4,905 GBP
Helzberg Diamonds£4,909 GBP

42 data points across 11 retailers

11 retailers£2,740 GBP to £4,909 GBP

A
Cheapest Retailer
-
£2,740 GBP
A
Retailer 2
-
£2,763 GBP
View
A
Retailer 3
-
£2,806 GBP
View
A
Retailer 4
-
£2,928 GBP
View
A
Retailer 5
-
£2,991 GBP
View
A
Retailer 6
-
£3,142 GBP
View
B+
Retailer 7
-
£3,470 GBP
View
B+
Retailer 8
-
£3,496 GBP
View
B+
Retailer 9
-
£3,522 GBP
View
B
Retailer 10
-
£4,905 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRJLLLPJNGJI · Nov 6
£4,909 GBP
$6,571 USD
View
10 more retailers have this diamond
Prices start from £2,740 GBPSave up to £2,170 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.

A
1.20ct Marquise
£2,740 GBP