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Round|Natural|GIA

1.51ct M SI2 Round Natural Diamond

EX • M/SI2 • GIA 1559703309

Certificate GIA 1559703309

Diamond specifications and retailer prices

From £1,816 GBP
As of November 6, 2026
Save £993 GBP (35%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £4,192 GBP at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded M colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1559703309. Listed at 11 retailers as of November 2, 2026, with a 55% 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
M
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 1559703309
Dimensions7.32 × 7.29 × 4.57 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal, Needle
Top View
7.32 mm7.29 mm1.51 ctM / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1559703309
Side View
Table 58.0%Crown 35°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 62.6%

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 6
Current: £2,262 GBP|Low: £1,797 GBP|High: £2,816 GBP|Avg: £2,239 GBP
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 4£1,816 GBP
Retailer 2£1,924 GBP
Retailer 5£2,184 GBP
Retailer 6£2,225 GBP
Retailer 1£2,262 GBP
Retailer 7£2,407 GBP
Retailer 3£2,809 GBP

43 data points across 7 retailers

11 retailers£1,816 GBP to £2,809 GBP

A
Cheapest Retailer
-
£1,816 GBP
A
Retailer 2
-
£1,924 GBP
View
B+
Retailer 3
-
£2,184 GBP
View
B+
Retailer 4
-
£2,225 GBP
View
B+
Retailer 5
-
£2,262 GBP
View
Retailer 6
-
£2,407 GBP
View
Price last confirmed 17 days ago
Retailer 7
-
£2,407 GBP
View
Price last confirmed 21 days ago
Retailer 8
-
£2,499 GBP
View
Price last confirmed 22 days ago
Retailer 9
-
£2,777 GBP
View
Price last confirmed 19 days ago
B
Retailer 10
-
£2,809 GBP
View
Most Expensive
NZ Jewellers
9fc923be-6068-412e-9d7a-3b73b8980827 · Oct 17
£4,192 GBP
$5,642 USD
View
Price last confirmed 19 days ago
10 more retailers have this diamond
Prices start from £1,816 GBPSave up to £993 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 Round
£1,816 GBP