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Marquise|Natural|GIA

1.20ct K SI1 Marquise Natural Diamond

VG • K/SI1 • GIA 1555561508

Certificate GIA 1555561508

Diamond specifications and retailer prices

From £2,078 GBP
As of November 5, 2026
Save £2,148 GBP (51%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £4,414 GBP at NZ Jewellers · As of September 30, 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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 1555561508. Listed at 10 retailers as of November 4, 2026, with a 103% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
K
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle39.97°
Pavilion angle40.64°
OriginNatural
Grading LabGIA
CertificateGIA 1555561508
Dimensions10.39 × 5.47 × 3.54 mm
L/W Ratio1.90
Culet sizeNone
Top View
10.39 mm5.47 mm1.20 ctK / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 1555561508
Side View
Table 60.0%Crown 39.97°Girdle: MED-THKPavilion 40.64°Culet: NoneDepth 64.7%

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 5
Current: £2,631 GBP|Low: £1,865 GBP|High: £4,288 GBP|Avg: £2,632 GBP|+1.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 2£1,865 GBP
Retailer 3£2,043 GBP
Retailer 7£2,078 GBP
Retailer 12£2,199 GBP
Retailer 10£2,266 GBP
Retailer 9£2,518 GBP
Retailer 11£2,518 GBP
Retailer 1£2,631 GBP
Retailer 4£2,754 GBP
Retailer 6£2,953 GBP
Retailer 8£3,692 GBP
Retailer 5£4,226 GBP

40 data points across 12 retailers

10 retailers£2,078 GBP to £4,226 GBP

B+
Cheapest Retailer
-
£2,078 GBP
B
Retailer 2
-
£2,199 GBP
View
B
Retailer 3
-
£2,266 GBP
View
B
Retailer 4
-
£2,518 GBP
View
B
Retailer 5
-
£2,518 GBP
View
B
Retailer 6
-
£2,631 GBP
View
B
Retailer 7
-
£2,953 GBP
View
C
Retailer 8
-
£3,692 GBP
View
B
Retailer 9
-
£4,226 GBP
View
Most Expensive
NZ Jewellers
ce9108f9-6f9e-4a33-8266-5974e0a46584 · Sep 30
£4,414 GBP
$5,908 USD
View
Price last confirmed 37 days ago
9 more retailers have this diamond
Prices start from £2,078 GBPSave up to £2,148 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
£2,078 GBP