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Radiant|Natural|IGI

1.57ct I SI1 Radiant Natural Diamond

VG • I/SI1 • IGI 770664057

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI 770664057

Diamond specifications and retailer prices

From £2,037 GBP
As of November 6, 2026
Save £2,497 GBP (55%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £4,534 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.57ct natural radiant diamond

This 1.57ct natural radiant sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI 770664057. Listed at 15 retailers as of November 5, 2026, with prices from £2,037 to £4,534, a £2,497 spread on the same certified stone. NZ Jewellers lists it at £4,534. 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

1.57
Carat
I
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.8°
Pavilion angle35.2°
OriginNatural
Grading LabIGI
CertificateIGI 770664057
Dimensions7.67 × 5.83 × 4.03 mm
L/W Ratio1.32
Girdle conditionFaceted
Culet sizePointed
Top View
7.67 mm5.83 mm1.57 ctI / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 770664057
Side View
Table 72.0%Crown 40.8°Girdle: MED-STKPavilion 35.2°Culet: NoneDepth 69.1%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £2,742 GBP|Low: £2,037 GBP|High: £4,398 GBP|Avg: £2,940 GBP|-0.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 7, 2026
Retailer 2£2,037 GBP
Retailer 3£2,456 GBP
Retailer 1£2,742 GBP
Retailer 4£3,030 GBP
Retailer 5£3,177 GBP
Retailer 6£4,341 GBP

28 data points across 6 retailers

15 retailers£2,037 GBP to £4,534 GBP

A
Cheapest Retailer
-
£2,037 GBP
A
Retailer 2
-
£2,311 GBP
View
Retailer 3
-
£2,428 GBP
View
Price last confirmed 95 days ago
A
Retailer 4
-
£2,456 GBP
View
B+
Retailer 5
-
£2,507 GBP
View
B+
Retailer 6
-
£2,603 GBP
View
Retailer 7
-
£2,603 GBP
View
Price last confirmed 9 days ago
B+
Retailer 8
-
£2,703 GBP
View
B+
Retailer 9
-
£2,711 GBP
View
A
Retailer 10
-
£2,742 GBP
View
B+
Retailer 11
-
£3,003 GBP
View
A
Retailer 12
-
£3,030 GBP
View
B+
Retailer 13
-
£3,177 GBP
View
B+
Retailer 14
-
£4,341 GBP
View
Most Expensive
B+
NZ Jewellers
0ecf2490-5f9c-44b3-8ce7-9bf1aa529f16 · Nov 5
£4,534 GBP
$6,069 USD
View
14 more retailers have this diamond
Prices start from £2,037 GBPSave up to £2,497 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
1.57ct Radiant
£2,037 GBP