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1.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 5566171647

Certificate GIA 5566171647

Diamond specifications and retailer prices

From £3,685 GBP
As of November 5, 2026
Save £3,697 GBP (50%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £7,382 GBP at Wholesale Diamonds Direct · As of November 6, 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 5566171647. Listed at 9 retailers as of November 5, 2026, with prices from £3,685 to £7,382, a £3,697 spread on the same certified stone. Wholesale Diamonds Direct lists it at £7,382. 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 angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 5566171647
Dimensions7.27 × 4.55 × 4.55 mm
L/W Ratio1.60
Culet sizeNone
Top View
7.27 mm4.55 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5566171647
Side View
Table 59.0%Crown 36°Girdle: MED-STKPavilion 41°Culet: 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 5
Current: £5,656 GBP|Low: £3,664 GBP|High: £7,901 GBP|Avg: £5,330 GBP|-7.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Wholesale Diamonds Direct
November 6, 2026
Retailer 2£3,685 GBP
Retailer 7£3,989 GBP
Retailer 8£4,406 GBP
Retailer 4£4,478 GBP
Retailer 3£5,040 GBP
Retailer 6£5,040 GBP
Retailer 1£5,656 GBP
Retailer 5£6,876 GBP
Wholesale Diamonds Direct£7,382 GBP

34 data points across 9 retailers

9 retailers£3,685 GBP to £7,382 GBP

A
Cheapest Retailer
-
£3,685 GBP
A
Retailer 2
-
£3,989 GBP
View
B+
Retailer 3
-
£4,406 GBP
View
B+
Retailer 4
-
£4,478 GBP
View
B+
Retailer 5
-
£5,040 GBP
View
B+
Retailer 6
-
£5,040 GBP
View
B+
Retailer 7
-
£5,656 GBP
View
B
Retailer 8
-
£6,876 GBP
View
Most Expensive
B
Wholesale Diamonds Direct
378293298 · Nov 6
£7,382 GBP
$9,880 USD
View
8 more retailers have this diamond
Prices start from £3,685 GBPSave up to £3,697 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
£3,685 GBP