Diamond lusture is the same thing as the brilliancy, right?

[Acadiamonds]

It''s how much the diamond shines/sparkles?

I know this might be a stupid question, but im new at this stuff.

 

[JulieN]

no, different materials have different luster.

 

[Lorelei]

Welcome

Read this thread here which will explain the different " components" of a diamond''s performance.

http://diamonds.pricescope.com/brill.asp

If by lustre you mean polish, this is the finish of the diamond which is self explanatory really - just the polished finish of the cut diamond.