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Round|Natural|GIA

1.51ct I SI1 Round Natural Diamond

GD • I/SI1 • GIA 2557750890

Certificate GIA 2557750890

Diamond specifications and retailer prices

From £1,958 GBP
HK$20,500 HKD
As of October 31, 2026
Save £2,601 GBP (57%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £4,559 GBP at NZ Jewellers · As of October 27, 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 standard cut grade and certified by GIA 2557750890. Listed at 18 retailers as of October 27, 2026, with prices from £1,958 to £4,559, a £2,601 spread on the same certified stone. NZ Jewellers lists it at £4,559. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
I
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryVery Good
FluorescenceMedium
Crown angle40°
Pavilion angle40.4°
OriginNatural
Grading LabGIA
CertificateGIA 2557750890
Dimensions7.00 × 6.92 × 4.67 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Top View
7.00 mm6.92 mm1.51 ctI / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 2557750890
Side View
Table 57.0%Crown 40°Girdle: THK-VTKPavilion 40.4°Culet: NoneDepth 67.1%

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 31
Current: £4,559 GBP|Low: £1,939 GBP|High: £4,694 GBP|Avg: £2,874 GBP|-2.9%
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
October 31, 2026
Retailer 10£1,958 GBP
Retailer 12£2,014 GBP
Retailer 3£2,185 GBP
Retailer 11£2,411 GBP
Retailer 16£2,411 GBP
Retailer 17£2,415 GBP
Retailer 5£2,617 GBP
Retailer 15£2,617 GBP
Retailer 6£2,717 GBP
Retailer 4£2,717 GBP
Retailer 7£2,795 GBP
Retailer 9£2,911 GBP
Retailer 8£2,961 GBP
Retailer 14£3,020 GBP
Retailer 2£3,217 GBP
Retailer 13£4,400 GBP
NZ Jewellers£4,559 GBP

37 data points across 17 retailers

18 retailers£1,958 GBP to £4,559 GBP

A
Cheapest Retailer
-
£1,958 GBP
HK$20,500 HKD
A
Retailer 2
-
£2,014 GBP
₹257,058 INR
View
B+
Retailer 3
-
£2,185 GBP
A$4,504 AUD
View
B+
Retailer 4
-
£2,411 GBP
$3,230 USD
View
B+
Retailer 5
-
£2,411 GBP
$3,230 USD
View
B+
Retailer 6
-
£2,415 GBP
$3,236 USD
View
Final sale: no returns
B+
Retailer 7
-
£2,556 GBP
A$5,268 AUD
View
B+
Retailer 8
-
£2,617 GBP
$3,506 USD
View
B+
Retailer 9
-
£2,617 GBP
$3,506 USD
View
B+
Retailer 10
-
£2,717 GBP
SGD 4,919 SGD
View
B+
Retailer 11
-
£2,717 GBP
$3,641 USD
View
B+
Retailer 12
-
£2,795 GBP
$3,745 USD
View
Retailer 13
-
£2,911 GBP
A$6,001 AUD
View
Price last confirmed 24 days ago
Retailer 14
-
£2,961 GBP
€3,778 EUR
View
Price last confirmed 10 days ago
B+
Retailer 15
-
£3,020 GBP
$4,046 USD
View
B+
Retailer 16
-
£3,217 GBP
ZAR 69,625 ZAR
View
B+
Retailer 17
-
£4,400 GBP
View
Most Expensive
B
NZ Jewellers
82aab777-aac8-4ee4-a9b1-3ad464c35c27 · Oct 27
£4,559 GBP
$6,109 USD
View
17 more retailers have this diamond
Prices start from £1,958 GBPSave up to £2,601 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
£1,958 GBP