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Marquise|Natural|GIA

1.00ct L SI1 Marquise Natural Diamond

EX • L/SI1 • GIA 1559603918

Certificate GIA 1559603918

Diamond specifications and retailer prices

From £1,262 GBP
As of November 5, 2026
Save £239 GBP (16%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £1,501 GBP at GemTrove · As of November 6, 2026
View at GemTrove

About this 1ct natural marquise diamond

This 1ct natural marquise sits in the classic one-carat band, graded L 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 1559603918. Listed at 3 retailers as of November 5, 2026, with prices from £1,262 to £1,501, a £239 spread on the same certified stone. GemTrove lists it at £1,501. 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
L
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1559603918
Dimensions10.05 × 5.17 × 3.28 mm
L/W Ratio1.94
Culet sizeNone
Key to symbols
Twinning Wisp, Feather
Top View
10.05 mm5.17 mm1.00 ctL / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 1559603918
Side View
Table 56.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 63.4%

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: £1,501 GBP|Low: £1,262 GBP|High: £1,501 GBP|Avg: £1,383 GBP
GemTrove
Retailer 2
Retailer 3
November 6, 2026
Retailer 3£1,262 GBP
Retailer 2£1,365 GBP
GemTrove£1,501 GBP

39 data points across 3 retailers

3 retailers£1,262 GBP to £1,501 GBP

B+
Cheapest Retailer
-
£1,262 GBP
B
Retailer 2
-
£1,365 GBP
View
Most Expensive
B
GemTrove
GT-N-01273368-98 · Nov 6
£1,501 GBP
A$3,108 AUD
View
2 more retailers have this diamond
Prices start from £1,262 GBPSave up to £239 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
£1,262 GBP