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Marquise|Natural|GIA

1.51ct K SI1 Marquise Natural Diamond

EX • K/SI1 • GIA 1558665399

Certificate GIA 1558665399

Diamond specifications and retailer prices

From £3,829 GBP
As of November 5, 2026
Save £2,542 GBP (40%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £6,708 GBP at NZ Jewellers · As of September 29, 2026
View at NZ Jewellers

About this 1.51ct natural marquise diamond

This 1.51ct natural marquise sits in the one-and-a-half to two 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 1558665399. Listed at 14 retailers as of November 4, 2026, with a 66% 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

1.51
Carat
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1558665399
Dimensions10.82 × 6.00 × 3.89 mm
L/W Ratio1.80
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Needle
Top View
10.82 mm6.00 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 1558665399
Side View
Table 63.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 64.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £3,891 GBP|Low: £3,829 GBP|High: £6,465 GBP|Avg: £4,530 GBP|-1.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 7£3,829 GBP
Retailer 2£3,875 GBP
Retailer 1£3,891 GBP
Retailer 6£4,011 GBP
Retailer 5£4,521 GBP
Retailer 3£4,894 GBP
Retailer 4£6,371 GBP

38 data points across 7 retailers

14 retailers£3,829 GBP to £6,371 GBP

A
Cheapest Retailer
-
£3,829 GBP
A
Retailer 2
-
£3,875 GBP
View
A
Retailer 3
-
£3,891 GBP
View
Retailer 4
-
£4,011 GBP
View
Price last confirmed 30 days ago
Retailer 5
-
£4,011 GBP
View
Price last confirmed 30 days ago
Retailer 6
-
£4,011 GBP
View
Price last confirmed 57 days ago
Retailer 7
-
£4,011 GBP
View
Price last confirmed 37 days ago
Retailer 8
-
£4,011 GBP
View
Price last confirmed 13 days ago
B+
Retailer 9
-
£4,521 GBP
View
Retailer 10
-
£4,628 GBP
View
Price last confirmed 39 days ago
Retailer 11
-
£4,628 GBP
View
Price last confirmed 57 days ago
B+
Retailer 12
-
£4,894 GBP
View
B
Retailer 13
-
£6,371 GBP
View
Most Expensive
NZ Jewellers
6b44963f-9bc3-4377-899b-8639dd877a1b · Sep 29
£6,708 GBP
$8,979 USD
View
Price last confirmed 38 days ago
13 more retailers have this diamond
Prices start from £3,829 GBPSave up to £2,542 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.

A
1.51ct Marquise
£3,829 GBP