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Marquise|Natural|GIA

1.00ct K SI1 Marquise Natural Diamond

EX • K/SI1 • GIA 1375003103

Certificate GIA 1375003103

Diamond specifications and retailer prices

From £1,637 GBP
As of November 6, 2026
Save £2,684 GBP (62%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £4,321 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1ct natural marquise diamond

This 1ct natural marquise sits in the classic one-carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1375003103. Listed at 19 retailers as of November 5, 2026, with prices from £1,637 to £4,321, a £2,684 spread on the same certified stone. NZ Jewellers lists it at £4,321. 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

1.00
Carat
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 1375003103
Dimensions10.03 × 5.08 × 3.32 mm
L/W Ratio1.97
Culet sizeNone
Top View
10.03 mm5.08 mm1.00 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 1375003103
Side View
Table 56.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 65.3%

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 6
Current: £2,175 GBP|Low: £1,616 GBP|High: £3,665 GBP|Avg: £2,295 GBP|+2.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 7£1,637 GBP
Retailer 5£1,857 GBP
Retailer 6£1,959 GBP
Retailer 8£2,161 GBP
Retailer 1£2,175 GBP
Retailer 4£2,410 GBP
Retailer 2£2,523 GBP
Retailer 3£3,612 GBP

44 data points across 8 retailers

19 retailers£1,637 GBP to £4,321 GBP

B+
Cheapest Retailer
-
£1,637 GBP
B+
Retailer 2
-
£1,683 GBP
View
B+
Retailer 3
-
£1,691 GBP
View
B+
Retailer 4
-
£1,766 GBP
View
B+
Retailer 5
-
£1,807 GBP
View
B
Retailer 6
-
£1,857 GBP
View
Retailer 7
-
£1,873 GBP
View
Price last confirmed 8 days ago
B
Retailer 8
-
£1,873 GBP
View
B
Retailer 9
-
£1,904 GBP
View
B
Retailer 10
-
£1,959 GBP
View
B
Retailer 11
-
£2,030 GBP
View
B
Retailer 12
-
£2,030 GBP
View
B
Retailer 13
-
£2,161 GBP
View
B+
Retailer 14
-
£2,175 GBP
View
B
Retailer 15
-
£2,410 GBP
View
B
Retailer 16
-
£2,523 GBP
View
B
Retailer 17
-
£2,977 GBP
View
B
Retailer 18
-
£3,612 GBP
View
Most Expensive
C
NZ Jewellers
d25ecab8-ce6f-41c4-a648-317ad859a575 · Nov 5
£4,321 GBP
$5,784 USD
View
18 more retailers have this diamond
Prices start from £1,637 GBPSave up to £2,684 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+
1.00ct Marquise
£1,637 GBP