Marquise|Natural|GIA

1.20ct H SI1 Marquise Natural Diamond

ID • H/SI1 • GIA 2557359146

Certificate GIA 2557359146

Diamond specifications and retailer prices

From £4,161 GBP
As of November 5, 2026
Save £714 GBP (15%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £7,709 GBP at NZ Jewellers · As of October 24, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2557359146. Listed at 19 retailers as of November 5, 2026, with a relatively tight 17% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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
H
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.24°
Pavilion angle41.41°
OriginNatural
Grading LabGIA
CertificateGIA 2557359146
Dimensions10.40 × 5.52 × 3.52 mm
L/W Ratio1.88
Girdle conditionVery Thick
Key to symbols
Crystal, Feather, Needle, Indented Natural
Top View
10.40 mm5.52 mm1.20 ctH / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557359146
Side View
Table 63.0%Crown 38.24°Girdle: Slightly ThickPavilion 41.41°Culet: NoneDepth 63.8%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £7,709 GBP|Low: £3,641 GBP|High: £7,709 GBP|Avg: £4,626 GBP
NZ Jewellers
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
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
Retailer 20
Retailer 21
Retailer 22
October 27, 2026
Retailer 6£3,641 GBP
Retailer 5£3,669 GBP
Retailer 3£3,672 GBP
Retailer 14£3,750 GBP
Retailer 20£3,886 GBP
Retailer 21£3,907 GBP
Retailer 11£4,125 GBP
Retailer 8£4,161 GBP
Retailer 17£4,176 GBP
Retailer 19£4,176 GBP
Retailer 22£4,176 GBP
Retailer 15£4,344 GBP
Retailer 9£4,388 GBP
Retailer 13£4,395 GBP
Retailer 18£4,501 GBP
Retailer 10£4,875 GBP
Retailer 16£5,009 GBP
Retailer 12£5,083 GBP
Retailer 2£5,612 GBP
Retailer 7£6,745 GBP
Retailer 4£6,799 GBP
NZ Jewellers£7,709 GBP

8 data points across 22 retailers

19 retailers£4,161 GBP to £4,875 GBP

Retailer 1
-
£3,641 GBP
Price last confirmed 11 days ago
Retailer 2
-
£3,669 GBP
View
Price last confirmed 11 days ago
Retailer 3
-
£3,672 GBP
View
Price last confirmed 12 days ago
Retailer 4
-
£3,886 GBP
View
Price last confirmed 12 days ago
Retailer 5
-
£3,907 GBP
View
Price last confirmed 10 days ago
Retailer 6
-
£4,125 GBP
View
Price last confirmed 12 days ago
B
Retailer 7
-
£4,161 GBP
View
Retailer 8
-
£4,176 GBP
View
Price last confirmed 11 days ago
Retailer 9
-
£4,176 GBP
View
Price last confirmed 12 days ago
Retailer 10
-
£4,176 GBP
View
Price last confirmed 12 days ago
B
Retailer 11
-
£4,388 GBP
View
Retailer 12
-
£4,395 GBP
View
Price last confirmed 10 days ago
B
Retailer 13
-
£4,875 GBP
View
Retailer 14
-
£5,009 GBP
View
Price last confirmed 11 days ago
Retailer 15
-
£5,083 GBP
View
Price last confirmed 28 days ago
Retailer 16
-
£5,612 GBP
View
Price last confirmed 10 days ago
Retailer 17
-
£6,745 GBP
View
Price last confirmed 14 days ago
Retailer 18
-
£6,799 GBP
View
Price last confirmed 11 days ago
Most Expensive
NZ Jewellers
1844168c-8e69-4a0c-b643-6b09d37bb58f · Oct 24
£7,709 GBP
$10,318 USD
View
Price under review
18 more retailers have this diamond
Prices start from £4,161 GBPSave up to £714 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
£4,161 GBP