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Round|Natural|GIA

1.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6555735876

Certificate GIA 6555735876

Diamond specifications and retailer prices

From £4,585 GBP
HK$48,000 HKD
As of November 1, 2026
Save £5,836 GBP (56%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £10,421 GBP at NZ Jewellers · As of October 30, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6555735876. Listed at 20 retailers as of October 30, 2026, with prices from £4,585 to £10,421, a £5,836 spread on the same certified stone. NZ Jewellers lists it at £10,421. 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 angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6555735876
Dimensions7.25 × 7.29 × 4.55 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Needle
Top View
7.25 mm7.29 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6555735876
Side View
Table 58.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.6%

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 1
Current: £10,421 GBP|Low: £4,547 GBP|High: £10,421 GBP|Avg: £6,388 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
November 2, 2026
Retailer 16£4,585 GBP
Retailer 7£4,923 GBP
Retailer 9£5,209 GBP
Retailer 5£5,211 GBP
Retailer 18£5,213 GBP
Retailer 3£5,644 GBP
Retailer 8£5,732 GBP
Retailer 13£5,841 GBP
Retailer 17£5,975 GBP
Retailer 12£6,202 GBP
Retailer 4£6,224 GBP
Retailer 10£6,224 GBP
Retailer 19£6,433 GBP
Retailer 6£6,513 GBP
Retailer 11£6,863 GBP
Retailer 2£6,904 GBP
Retailer 15£7,655 GBP
Retailer 14£8,683 GBP
NZ Jewellers£10,421 GBP

35 data points across 19 retailers

20 retailers£4,585 GBP to £10,421 GBP

B+
Cheapest Retailer
-
£4,585 GBP
HK$48,000 HKD
B+
Retailer 2
-
£4,681 GBP
A$9,650 AUD
View
B+
Retailer 3
-
£4,923 GBP
$6,596 USD
View
B+
Retailer 4
-
£5,209 GBP
$6,980 USD
View
Final sale: no returns
B+
Retailer 5
-
£5,211 GBP
$6,982 USD
View
B+
Retailer 6
-
£5,213 GBP
$6,985 USD
View
B
Retailer 7
-
£5,644 GBP
$7,563 USD
View
B+
Retailer 8
-
£5,732 GBP
$7,680 USD
View
B+
Retailer 9
-
£5,841 GBP
View
Retailer 10
-
£5,975 GBP
A$12,317 AUD
View
Price last confirmed 11 days ago
B+
Retailer 11
-
£6,202 GBP
€7,914 EUR
View
B
Retailer 12
-
£6,224 GBP
$8,340 USD
View
B
Retailer 13
-
£6,224 GBP
$8,340 USD
View
B
Retailer 14
-
£6,433 GBP
$8,620 USD
View
B
Retailer 15
-
£6,513 GBP
$8,727 USD
View
Retailer 16
-
£6,863 GBP
$9,196 USD
View
Price last confirmed 10 days ago
B
Retailer 17
-
£6,904 GBP
View
B
Retailer 18
-
£7,655 GBP
ZAR 165,691 ZAR
View
B
Retailer 19
-
£8,683 GBP
View
Most Expensive
B
NZ Jewellers
709b4404-daec-4c0b-b654-fb474c7a1d60 · Oct 30
£10,421 GBP
$13,963 USD
View
19 more retailers have this diamond
Prices start from £4,585 GBPSave up to £5,836 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
£4,585 GBP