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Marquise|Natural|GIA

1.20ct I SI1 Marquise Natural Diamond

VG • I/SI1 • GIA 5241054637

Certificate GIA 5241054637

Diamond specifications and retailer prices

From £2,746 GBP
As of November 4, 2026
Save £2,174 GBP (44%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £4,920 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 very-good cut grade stated by the retailer rather than the lab and certified by GIA 5241054637. Listed at 14 retailers as of November 4, 2026, with prices from £2,746 to £4,920, a £2,174 spread on the same certified stone. Helzberg Diamonds lists it at £4,920. 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
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.62°
Pavilion angle40.02°
OriginNatural
Grading LabGIA
CertificateGIA 5241054637
Dimensions10.10 × 5.46 × 3.58 mm
L/W Ratio1.85
Culet sizeNone
Top View
10.10 mm5.46 mm1.20 ctI / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5241054637
Side View
Table 59.0%Crown 40.62°Girdle: STK-VTKPavilion 40.02°Culet: NDepth 65.6%

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: £4,920 GBP|Low: £2,746 GBP|High: £5,301 GBP|Avg: £3,545 GBP|-6.0%
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
Retailer 14
November 6, 2026
Retailer 10£2,746 GBP
Retailer 12£2,789 GBP
Retailer 6£2,871 GBP
Retailer 9£2,930 GBP
Retailer 8£2,935 GBP
Retailer 4£2,998 GBP
Retailer 5£3,018 GBP
Retailer 7£3,149 GBP
Retailer 14£3,479 GBP
Retailer 3£3,504 GBP
Retailer 2£3,531 GBP
Retailer 11£4,631 GBP
Retailer 13£4,888 GBP
Helzberg Diamonds£4,920 GBP

35 data points across 14 retailers

14 retailers£2,746 GBP to £4,920 GBP

B+
Cheapest Retailer
-
£2,746 GBP
B+
Retailer 2
-
£2,789 GBP
View
B+
Retailer 3
-
£2,871 GBP
View
B+
Retailer 4
-
£2,930 GBP
View
B+
Retailer 5
-
£2,935 GBP
View
B+
Retailer 6
-
£2,998 GBP
View
B+
Retailer 7
-
£3,018 GBP
View
B
Retailer 8
-
£3,149 GBP
View
B
Retailer 9
-
£3,479 GBP
View
B
Retailer 10
-
£3,504 GBP
View
B
Retailer 11
-
£3,531 GBP
View
B
Retailer 12
-
£4,631 GBP
View
B
Retailer 13
-
£4,888 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRLIKHGLKMJN · Nov 6
£4,920 GBP
$6,585 USD
View
13 more retailers have this diamond
Prices start from £2,746 GBPSave up to £2,174 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
£2,746 GBP