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Radiant|Lab Grown|IGI

1.57ct D SI1 Radiant Lab Grown Diamond

GD • D/SI1 • IGI LG497145476

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

Certificate IGI LG497145476

Diamond specifications and retailer prices

From £118 GBP
$158 USD
As of October 30, 2026
Save £640 GBP (84%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £758 GBP at Rare Carat · As of October 28, 2026
View at Rare Carat

About this 1.57ct lab-grown radiant diamond

This 1.57ct lab-grown radiant sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG497145476 or 497145476. Listed at 15 retailers as of October 28, 2026, with prices from £118 to £758, a £640 spread on the same certified stone. Rare Carat lists it at £758. 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
D
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.4°
Pavilion angle29.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG497145476
Dimensions7.72 × 5.68 × 3.86 mm
L/W Ratio1.36
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.72 mm5.68 mm1.57 ctD / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG497145476
Side View
Table 64.0%Crown 40.4°Girdle: Slightly ThickPavilion 29.4°Culet: NoneDepth 68.0%

Caratlytics Score

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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: Oct 30
Current: £758 GBP|Low: £113 GBP|High: £866 GBP|Avg: £359 GBP|-12.5%
Rare Carat
Retailer 2
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Retailer 11
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Retailer 16
October 31, 2026
Retailer 14£118 GBP
Retailer 12£137 GBP
Retailer 13£146 GBP
Retailer 16£146 GBP
Retailer 6£162 GBP
Retailer 2£256 GBP
Retailer 10£265 GBP
Retailer 3£266 GBP
Retailer 5£381 GBP
Retailer 4£400 GBP
Retailer 8£468 GBP
Retailer 15£471 GBP
Retailer 11£498 GBP
Retailer 7£512 GBP
Retailer 9£689 GBP
Rare Carat£758 GBP

43 data points across 16 retailers

15 retailers£118 GBP to £758 GBP

A
Cheapest Retailer
-
£118 GBP
$158 USD
B+
Retailer 2
-
£137 GBP
$184 USD
View
B+
Retailer 3
-
£146 GBP
$196 USD
View
A
Retailer 4
-
£146 GBP
$196 USD
View
B+
Retailer 5
-
£256 GBP
View
B+
Retailer 6
-
£265 GBP
View
B
Retailer 7
-
£266 GBP
$357 USD
View
B+
Retailer 8
-
£381 GBP
$510 USD
View
B+
Retailer 9
-
£400 GBP
$536 USD
View
B
Retailer 10
-
£468 GBP
HK$4,900 HKD
View
B+
Retailer 11
-
£471 GBP
$631 USD
View
B
Retailer 12
-
£498 GBP
$667 USD
View
B
Retailer 13
-
£512 GBP
$686 USD
View
B
Retailer 14
-
£689 GBP
View
Most Expensive
B
Rare Carat
497145476_l_497145476 · Oct 28
£758 GBP
$1,015 USD
View
14 more retailers have this diamond
Prices start from £118 GBPSave up to £640 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
£118 GBP