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Round|Natural|GIA

1.51ct N SI1 Round Natural Diamond

EX • N/SI1 • GIA 7556591711

Certificate GIA 7556591711

Diamond specifications and retailer prices

From £1,839 GBP
As of November 6, 2026
Save £613 GBP (25%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £4,171 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 N colour (tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 7556591711. Listed at 9 retailers as of October 31, 2026, with a 33% 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
N
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 7556591711
Dimensions7.34 × 7.31 × 4.59 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Needle
Top View
7.34 mm7.31 mm1.51 ctN / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 7556591711
Side View
Table 56.0%Crown 35.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £1,884 GBP|Low: £1,839 GBP|High: £3,223 GBP|Avg: £2,444 GBP|-10.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 2£1,839 GBP
Retailer 1£1,884 GBP
Retailer 5£1,995 GBP
Retailer 3£2,375 GBP
Retailer 4£2,452 GBP
Retailer 6£2,962 GBP
Retailer 7£3,223 GBP

22 data points across 7 retailers

9 retailers£1,839 GBP to £2,452 GBP

B+
Cheapest Retailer
-
£1,839 GBP
B+
Retailer 2
-
£1,884 GBP
View
Retailer 3
-
£1,995 GBP
View
Price last confirmed 17 days ago
Retailer 4
-
£1,995 GBP
View
Price last confirmed 21 days ago
Retailer 5
-
£2,072 GBP
View
Price last confirmed 22 days ago
Retailer 6
-
£2,302 GBP
View
Price last confirmed 19 days ago
B+
Retailer 7
-
£2,375 GBP
View
B
Retailer 8
-
£2,452 GBP
View
Most Expensive
NZ Jewellers
48d26669-4c5d-40b5-b7ca-cb9720f662d9 · Oct 17
£4,171 GBP
$5,614 USD
View
Price last confirmed 20 days ago
8 more retailers have this diamond
Prices start from £1,839 GBPSave up to £613 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+
1.51ct Round
£1,839 GBP