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Round|Natural|GIA

1.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2566054289

Certificate GIA 2566054289

Diamond specifications and retailer prices

From £4,106 GBP
$5,502 USD
As of October 30, 2026
Save £3,346 GBP (45%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £8,641 GBP at NZ Jewellers · As of September 28, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2566054289. Listed at 19 retailers as of October 30, 2026, with a 81% 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2566054289
Dimensions7.28 × 7.32 × 4.59 mm
L/W Ratio1.01
Star length50%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Knot, Feather, Needle
Top View
7.28 mm7.32 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2566054289
Side View
Table 56.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.8%

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: Oct 30
Current: £5,500 GBP|Low: £4,106 GBP|High: £7,704 GBP|Avg: £5,283 GBP|-1.3%
Retailer 1
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
November 1, 2026
Retailer 2£4,106 GBP
Retailer 5£4,224 GBP
Retailer 13£4,229 GBP
Retailer 3£4,282 GBP
Retailer 6£4,471 GBP
Retailer 15£4,500 GBP
Retailer 4£4,770 GBP
Retailer 7£4,933 GBP
Retailer 12£4,933 GBP
Retailer 9£5,094 GBP
Retailer 14£5,190 GBP
Retailer 1£5,500 GBP
Retailer 11£5,711 GBP
Retailer 10£6,570 GBP
Retailer 8£7,452 GBP

40 data points across 15 retailers

19 retailers£4,106 GBP to £7,452 GBP

A
Cheapest Retailer
-
£4,106 GBP
$5,502 USD
B+
Retailer 2
-
£4,224 GBP
$5,660 USD
View
B+
Retailer 3
-
£4,229 GBP
$5,666 USD
View
B+
Retailer 4
-
£4,282 GBP
$5,737 USD
View
B+
Retailer 5
-
£4,471 GBP
$5,990 USD
View
Final sale: no returns
B+
Retailer 6
-
£4,500 GBP
$6,030 USD
View
B+
Retailer 7
-
£4,770 GBP
$6,391 USD
View
B+
Retailer 8
-
£4,933 GBP
$6,610 USD
View
Retailer 9
-
£4,933 GBP
$6,610 USD
View
Price last confirmed 17 days ago
B+
Retailer 10
-
£5,094 GBP
View
Retailer 11
-
£5,167 GBP
$6,923 USD
View
Price last confirmed 24 days ago
Retailer 12
-
£5,190 GBP
A$10,698 AUD
View
Price last confirmed 10 days ago
Retailer 13
-
£5,246 GBP
$7,029 USD
View
Price last confirmed 33 days ago
B+
Retailer 14
-
£5,500 GBP
View
B+
Retailer 15
-
£5,711 GBP
€7,288 EUR
View
Retailer 16
-
£5,962 GBP
$7,988 USD
View
Price last confirmed 33 days ago
B
Retailer 17
-
£6,570 GBP
ZAR 142,210 ZAR
View
B
Retailer 18
-
£7,452 GBP
View
Most Expensive
NZ Jewellers
2cc99845-ad31-4206-9a33-efb150097eb4 · Sep 28
£8,641 GBP
$11,578 USD
View
Price last confirmed 34 days ago
18 more retailers have this diamond
Prices start from £4,106 GBPSave up to £3,346 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
£4,106 GBP