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Marquise|Natural|GIA

1.20ct I SI1 Marquise Natural Diamond

GD • I/SI1 • GIA 5553831752

Certificate GIA 5553831752

Diamond specifications and retailer prices

From £2,565 GBP
As of November 4, 2026
Save £2,031 GBP (44%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £4,596 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 5553831752. Listed at 13 retailers as of November 4, 2026, with prices from £2,565 to £4,596, a £2,031 spread on the same certified stone. Helzberg Diamonds lists it at £4,596. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.20
Carat
I
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle42.81°
Pavilion angle40.44°
OriginNatural
Grading LabGIA
CertificateGIA 5553831752
Dimensions10.07 × 5.44 × 3.66 mm
L/W Ratio1.85
Culet sizeNone
Top View
10.07 mm5.44 mm1.20 ctI / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5553831752
Side View
Table 60.0%Crown 42.81°Girdle: MED-VTKPavilion 40.44°Culet: NoneDepth 67.3%

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 4
Current: £4,596 GBP|Low: £2,565 GBP|High: £4,934 GBP|Avg: £3,394 GBP|-6.8%
Helzberg Diamonds
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 9£2,565 GBP
Retailer 11£2,607 GBP
Retailer 7£2,628 GBP
Retailer 10£2,741 GBP
Retailer 4£2,800 GBP
Retailer 6£2,944 GBP
Retailer 8£3,238 GBP
Retailer 13£3,261 GBP
Retailer 3£3,296 GBP
Retailer 2£3,297 GBP
Retailer 12£4,327 GBP
Retailer 5£4,574 GBP
Helzberg Diamonds£4,596 GBP

32 data points across 13 retailers

13 retailers£2,565 GBP to £4,596 GBP

B+
Cheapest Retailer
-
£2,565 GBP
B+
Retailer 2
-
£2,607 GBP
View
B+
Retailer 3
-
£2,628 GBP
View
B+
Retailer 4
-
£2,741 GBP
View
B+
Retailer 5
-
£2,800 GBP
View
B
Retailer 6
-
£2,944 GBP
View
B
Retailer 7
-
£3,238 GBP
View
B
Retailer 8
-
£3,261 GBP
View
B
Retailer 9
-
£3,296 GBP
View
B
Retailer 10
-
£3,297 GBP
View
B
Retailer 11
-
£4,327 GBP
View
B
Retailer 12
-
£4,574 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRLLLJOJHNLI · Nov 6
£4,596 GBP
$6,152 USD
View
12 more retailers have this diamond
Prices start from £2,565 GBPSave up to £2,031 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
£2,565 GBP