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1.64ct M SI1 Round Natural Diamond

EX • M/SI1 • IGI 245635868

Shape and cutting style on the report: Round brilliant

Certificate IGI 245635868

Diamond specifications and retailer prices

From £1,980 GBP
As of November 1, 2026
Save £906 GBP (31%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £2,886 GBP at Yorxs · As of November 5, 2026
View at Yorxs

About this 1.64ct natural round diamond

This 1.64ct natural round sits in the one-and-a-half to two carat band, graded M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 245635868. Listed at 2 retailers as of November 1, 2026, with prices from £1,980 to £2,886, a £906 spread on the same certified stone. Yorxs lists it at £2,886. 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

1.64
Carat
M
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceFaint
Crown angle33°
Pavilion angle41.1°
OriginNatural
Grading LabIGI
CertificateIGI 245635868
Dimensions7.74 × 7.70 × 4.54 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.74 mm7.70 mm1.64 ctM / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateIGI 245635868
Side View
Table 61.5%Crown 33°Girdle: THN-MEDPavilion 41.1°Culet: NoneDepth 58.8%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 1
Current: £1,980 GBP|Low: £1,980 GBP|High: £2,908 GBP|Avg: £2,432 GBP|-0.2%
Retailer 1
Yorxs
November 5, 2026
Retailer 1£1,980 GBP
Yorxs£2,886 GBP

21 data points across 2 retailers

2 retailers£1,980 GBP to £2,886 GBP

B+
Cheapest Retailer
-
£1,980 GBP
Most Expensive
B
Yorxs
62C836053 · Nov 5
£2,886 GBP
€3,699 EUR
View
1 more retailer has this diamond
Prices start from £1,980 GBPSave up to £906 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+
1.64ct Round
£1,980 GBP