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Marquise|Natural|IGI

1.51ct G SI2 Marquise Natural Diamond

ID • G/SI2 • IGI 811

Certificate IGI 811

Diamond specifications and retailer prices

From £2,821 GBP
As of November 4, 2026
Save £2,235 GBP (44%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £5,056 GBP at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.51ct natural marquise diamond

This 1.51ct natural marquise sits in the one-and-a-half to two carat band, graded G colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI. Listed at 3 retailers as of November 4, 2026, with prices from £2,821 to £5,056, a £2,235 spread on the same certified stone. Helzberg Diamonds lists it at £5,056. 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
G
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabIGI
CertificateIGI 811
Dimensions11.36 × 6.01 × 3.71 mm
L/W Ratio1.89
Top View
11.36 mm6.01 mm1.51 ctG / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 811
Side View
Table 57.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 61.7%

Caratlytics Score

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

Price History

Last verified: Nov 4
Current: £5,056 GBP|Low: £2,483 GBP|High: £6,000 GBP|Avg: £4,058 GBP|-11.9%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 5, 2026
Retailer 5£2,483 GBP
Retailer 3£2,821 GBP
Retailer 2£2,988 GBP
Helzberg Diamonds£5,056 GBP
Retailer 4£6,000 GBP

22 data points across 5 retailers

3 retailers£2,821 GBP to £5,056 GBP

A
Cheapest Retailer
-
£2,821 GBP
A
Retailer 2
-
£2,988 GBP
View
Most Expensive
A
Helzberg Diamonds
ZXZOIKMGKMIN · Nov 6
£5,056 GBP
$6,767 USD
View
2 more retailers have this diamond
Prices start from £2,821 GBPSave up to £2,235 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
£2,821 GBP