Marquise|Natural|GIA

1.20ct D SI1 Marquise Natural Diamond

EX • D/SI1 • GIA 6555015831

Certificate GIA 6555015831

Diamond specifications and retailer prices

From £3,752 GBP
As of November 6, 2026
Save £3,199 GBP (46%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £8,276 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6555015831. Listed at 20 retailers as of November 2, 2026, with a 85% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6555015831
Dimensions12.15 × 5.28 × 3.03 mm
L/W Ratio2.30
Top View
12.15 mm5.28 mm1.20 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6555015831
Side View
Table 64.0%CrownGirdle: THK-ETKPavilionCulet: NoneDepth 57.5%

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 6
Current: £4,707 GBP|Low: £3,752 GBP|High: £7,378 GBP|Avg: £5,096 GBP|-2.8%
Retailer 1
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 4£3,752 GBP
Retailer 11£3,870 GBP
Retailer 2£4,079 GBP
Retailer 8£4,142 GBP
Retailer 9£4,397 GBP
Retailer 1£4,707 GBP
Retailer 12£4,707 GBP
Retailer 5£4,712 GBP
Retailer 7£4,864 GBP
Retailer 13£5,135 GBP
Retailer 6£5,256 GBP
Retailer 10£5,647 GBP
Retailer 3£6,461 GBP
Retailer 14£6,951 GBP

38 data points across 14 retailers

20 retailers£3,752 GBP to £6,951 GBP

B+
Cheapest Retailer
-
£3,752 GBP
B+
Retailer 2
-
£3,870 GBP
View
Final sale: no returns
B+
Retailer 3
-
£4,079 GBP
View
B+
Retailer 4
-
£4,142 GBP
View
B+
Retailer 5
-
£4,397 GBP
View
Retailer 6
-
£4,483 GBP
View
Price last confirmed 37 days ago
Retailer 7
-
£4,483 GBP
View
Price last confirmed 37 days ago
B
Retailer 8
-
£4,518 GBP
View
B+
Retailer 9
-
£4,707 GBP
View
B+
Retailer 10
-
£4,707 GBP
View
Retailer 11
-
£4,712 GBP
View
Price last confirmed 28 days ago
B+
Retailer 12
-
£4,864 GBP
View
B
Retailer 13
-
£5,135 GBP
View
Retailer 14
-
£5,173 GBP
View
Price last confirmed 53 days ago
Retailer 15
-
£5,173 GBP
View
Price last confirmed 39 days ago
Retailer 16
-
£5,256 GBP
View
Price last confirmed 15 days ago
B
Retailer 17
-
£5,647 GBP
View
Retailer 18
-
£6,461 GBP
View
Price last confirmed 10 days ago
B
Retailer 19
-
£6,951 GBP
View
Most Expensive
NZ Jewellers
ded45a2b-0ace-4b94-9ef8-4363f099808d · Sep 30
£8,276 GBP
$11,078 USD
View
Price last confirmed 37 days ago
19 more retailers have this diamond
Prices start from £3,752 GBPSave up to £3,199 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
£3,752 GBP