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Round|Natural|GIA

1.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6565157448

Certificate GIA 6565157448

Diamond specifications and retailer prices

From £3,686 GBP
As of November 1, 2026
Save £2,592 GBP (41%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £6,769 GBP at Wholesale Diamonds Direct · As of October 26, 2026
View at Wholesale Diamonds Direct

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6565157448. Listed at 10 retailers as of November 1, 2026, with a 70% 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.5°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 6565157448
Dimensions7.31 × 4.55 × 4.55 mm
L/W Ratio1.61
Culet sizeNone
Top View
7.31 mm4.55 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6565157448
Side View
Table 59.0%Crown 33.5°Girdle: MED-STKPavilion 41.8°Culet: NoneDepth 62.0%

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 1
Current: £3,813 GBP|Low: £3,686 GBP|High: £7,491 GBP|Avg: £4,784 GBP|-9.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Wholesale Diamonds Direct
November 5, 2026
Retailer 6£3,686 GBP
Retailer 1£3,813 GBP
Retailer 4£3,942 GBP
Retailer 5£4,063 GBP
Retailer 2£4,140 GBP
Retailer 7£4,393 GBP
Retailer 9£4,631 GBP
Retailer 3£4,791 GBP
Retailer 8£6,279 GBP
Wholesale Diamonds Direct£6,769 GBP

36 data points across 10 retailers

10 retailers£3,686 GBP to £6,279 GBP

A
Cheapest Retailer
-
£3,686 GBP
A
Retailer 2
-
£3,813 GBP
View
A
Retailer 3
-
£3,942 GBP
View
A
Retailer 4
-
£4,063 GBP
View
A
Retailer 5
-
£4,140 GBP
View
A
Retailer 6
-
£4,393 GBP
View
B+
Retailer 7
-
£4,631 GBP
View
B+
Retailer 8
-
£4,791 GBP
View
B
Retailer 9
-
£6,279 GBP
View
Most Expensive
Wholesale Diamonds Direct
299902968 · Oct 26
£6,769 GBP
$9,060 USD
View
Price last confirmed 10 days ago
9 more retailers have this diamond
Prices start from £3,686 GBPSave up to £2,592 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
£3,686 GBP