CaratHunter
Plans
Round|Natural|GIA

1.51ct G SI1 Round Natural Diamond

ID • G/SI1 • GIA 294

Certificate GIA 294

Diamond specifications and retailer prices

From £4,278 GBP
As of November 4, 2026
Save £8,035 GBP (65%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £12,313 GBP at Blue Nile · As of November 5, 2026
View at Blue Nile

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at 5 retailers as of November 4, 2026, with prices from £4,278 to £12,313, a £8,035 spread on the same certified stone. Blue Nile lists it at £12,313. 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
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 294
Dimensions7.31 × 7.35 × 4.58 mm
L/W Ratio1.01
Top View
7.31 mm7.35 mm1.51 ctG / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 294
Side View
Table 58.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 62.4%

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 4
Current: £5,127 GBP|Low: £4,278 GBP|High: £9,870 GBP|Avg: £6,622 GBP|-16.6%
Blue Nile
Retailer 2
Retailer 3
November 4, 2026
Retailer 2£4,278 GBP
Blue Nile£5,127 GBP
Retailer 3£9,870 GBP

12 data points across 3 retailers

5 retailers£4,278 GBP to £12,313 GBP

A
Cheapest Retailer
-
£4,278 GBP
A
Retailer 2
-
£5,127 GBP
View
B
Retailer 3
-
£9,870 GBP
View
B
Retailer 4
-
£10,624 GBP
View
Most Expensive
B
Blue Nile
121719 · Nov 5
£12,313 GBP
$16,572 USD
View
4 more retailers have this diamond
Prices start from £4,278 GBPSave up to £8,035 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
£4,278 GBP