How to join two Style[]d strings

Use Row to join them:

Omega = "text";
joined = Row[{Style[Omega, Lighter[Blue, .1]], Style[Omega, Darker[LightBlue, .1]]}];
Print[joined]

Given two styled items:

omega = "text"

items = { Style[omega,Lighter[Blue,.1]], Style[omega,Darker[LightBlue,.1]] }

We can produce a single string with both stylings if we convert each item into a StandardForm string prior to joining them:

Apply[StringJoin, ToString[#, StandardForm] & /@ items]

The following screenshot shows the results:

styled concatenation session

If you evaluate or print the following string you get what you want:

"\!\(\*StyleBox[\"text\",FontColor->RGBColor[1, 0, 0]]\) \!\(\*StyleBox[\"text\",FontColor->RGBColor[0, 0, 1]]\)"

Mathematica graphics

This is a single string and it contains color information for different substrings.

Do[Print@"\!\(\*StyleBox[\"text\",FontColor->RGBColor[1, 0, 0]]\) \!\(\*StyleBox[\"text\",FontColor->RGBColor[0, 0, 1]]\)", {5}]

Mathematica graphics

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