CaratHunter
Plans
Radiant|Lab Grown|IGI

1.31ct E SI1 Radiant Lab Grown Diamond

ID • E/SI1

Diamond specifications and retailer prices

From $361 SGD
£222 GBP
As of October 29, 2026
Save $474 SGD (57%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $835 SGD at Blue Nile · As of October 29, 2026
View at Blue Nile

About this 1.31ct lab-grown radiant diamond

This 1.31ct lab-grown radiant sits in the one-and-a-quarter to one-and-a-half carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI. Listed at 2 retailers as of October 29, 2026, with prices from $361 to $835, a $474 spread on the same certified stone. Blue Nile lists it at $835. 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

1.31
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions7.82 × 5.30 × 3.59 mm
L/W Ratio1.48
Top View
7.82 mm5.30 mm1.31 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 66.0%CrownGirdle: MediumPavilionCulet: NoneDepth 67.7%

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 29
Current: $835 SGD|Low: $202 SGD|High: $888 SGD|Avg: $500 SGD
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
October 29, 2026
Retailer 4$202 SGD
Retailer 5$234 SGD
Retailer 2$361 SGD
Blue Nile$835 SGD
Retailer 3$888 SGD

36 data points across 5 retailers

2 retailers$361 SGD to $835 SGD

A
Cheapest Retailer
-
$361 SGD
£222 GBP
Most Expensive
B
Blue Nile
20122854 · Oct 29
$835 SGD
$653 USD
View
1 more retailer has this diamond
Prices start from $361 SGDSave up to $474 SGD

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
1.31ct Radiant
$361 SGD