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1.31ct M SI1 Round Natural Diamond

EX • M/SI1 • GIA 2556536766

Certificate GIA 2556536766

Diamond specifications and retailer prices

From £1,226 GBP
As of November 5, 2026
Save £309 GBP (20%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £1,535 GBP at GemTrove · As of November 6, 2026
View at GemTrove

About this 1.31ct natural round diamond

This 1.31ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2556536766. Listed at 2 retailers as of November 5, 2026, with prices from £1,226 to £1,535, a £309 spread on the same certified stone. GemTrove lists it at £1,535. 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

1.31
Carat
M
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle34.5°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 2556536766
Dimensions7.04 × 6.99 × 4.38 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Feather, Twinning Wisp, Crystal, Needle, Natural
Top View
7.04 mm6.99 mm1.31 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2556536766
Side View
Table 55.0%Crown 34.5°Girdle: MediumPavilion 41.4°Culet: NoneDepth 62.5%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 5
Current: £1,535 GBP|Low: £1,226 GBP|High: £1,535 GBP|Avg: £1,392 GBP
GemTrove
Retailer 2
October 17, 2026
Retailer 2£1,226 GBP
GemTrove£1,535 GBP

3 data points across 2 retailers

2 retailers£1,226 GBP to £1,535 GBP

A
Cheapest Retailer
-
£1,226 GBP
Most Expensive
B+
GemTrove
GT-N-01364697-98 · Nov 6
£1,535 GBP
A$3,178 AUD
View
1 more retailer has this diamond
Prices start from £1,226 GBPSave up to £309 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
1.31ct Round
£1,226 GBP