Insert a Part or object into the Workspace
Add a ParticleEmitter to the object
Set the ParticleEmitter Texture to a sparkle-like image
Adjust Rate to a low or medium value
Set Lifetime to a short range
Set Speed to 0 or a very small range
Set Size to a small range
Set Transparency to fade in and out
Set LightEmission to a higher value
Set Color to bright white or a glowing color
Set SpreadAngle to a small range
Enable EmissionDirection if needed
Add a PointLight to the object
Set the PointLight Brightness to a low or medium value
Set the PointLight Range to fit the object size
Use a Script to toggle the sparkle on and off if needed
Parent the ParticleEmitter and PointLight to the same object
Test and adjust the properties in Play mode