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Round|Natural|IGI

1.50ct M SI1 Round Natural Diamond

EX • M/SI1 • IGI 550250291

Shape and cutting style on the report: Round brilliant

Certificate IGI 550250291

Diamond specifications and retailer prices

From £1,135 GBP
As of November 5, 2026
Save £2,368 GBP (68%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £3,503 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.5ct natural round diamond

This 1.5ct 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 550250291. Listed at 13 retailers as of November 5, 2026, with prices from £1,135 to £3,503, a £2,368 spread on the same certified stone. NZ Jewellers lists it at £3,503. 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

1.50
Carat
M
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.4°
Pavilion angle40.1°
OriginNatural
Grading LabIGI
CertificateIGI 550250291
Dimensions7.39 × 7.43 × 4.36 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.39 mm7.43 mm1.50 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 550250291
Side View
Table 61.5%Crown 32.4°Girdle: MED-STKPavilion 40.1°Culet: NoneDepth 58.7%

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: £1,564 GBP|Low: £1,135 GBP|High: £1,967 GBP|Avg: £1,515 GBP|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 2£1,135 GBP
Retailer 5£1,298 GBP
Retailer 7£1,436 GBP
Retailer 6£1,467 GBP
Retailer 1£1,564 GBP
Retailer 3£1,753 GBP
Retailer 4£1,949 GBP

39 data points across 7 retailers

13 retailers£1,135 GBP to £3,503 GBP

A
Cheapest Retailer
-
£1,135 GBP
B+
Retailer 2
-
£1,298 GBP
View
B+
Retailer 3
-
£1,400 GBP
View
B+
Retailer 4
-
£1,436 GBP
View
Retailer 5
-
£1,436 GBP
View
Price last confirmed 8 days ago
B+
Retailer 6
-
£1,467 GBP
View
B+
Retailer 7
-
£1,503 GBP
View
B+
Retailer 8
-
£1,539 GBP
View
A
Retailer 9
-
£1,564 GBP
View
B+
Retailer 10
-
£1,658 GBP
View
B+
Retailer 11
-
£1,753 GBP
View
B+
Retailer 12
-
£1,949 GBP
View
Most Expensive
B
NZ Jewellers
8beecb8e-053c-42f6-8142-5f90efbb540c · Nov 5
£3,503 GBP
$4,715 USD
View
12 more retailers have this diamond
Prices start from £1,135 GBPSave up to £2,368 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
1.50ct Round
£1,135 GBP