No, they shouldn't always be capitalized. Emeralds should only be capitalized at the beginning of a sentence (e.g. "Emeralds, like all colored gemstones, are graded using four basic parameters"), or when in a title. (e.g. "Ruby, Sapphire and Emerald Buying Guide").
Yes it should always be capitalized.
Yes, it should always be capitalized.
The word Copyright should always be capitalized. It is a specific name for a specific thing.
Yes, Italian is always capitalized.
No it should only be capitalized if it forms part of a title.
Yes, it should always be capitalized.
Yes it should always be capitalized.
Yes it should always be capitalized.
Yes, it should always be capitalized.
Yes, it should always be capitalized.
Yes, "I am" is typically capitalized because "I" is a pronoun and should always be capitalized in English.
Yes, both Hindu and Hinduism should always be capitalized.
When it refers to the language, it should always be capitalized.
Yes it should be capitalized.
"space shuttle" usually is not capitalized unless you're talking about "The Space Shuttle". Endeavour should always be capitalized because it is the name of the orbiter, and names should always be capitalized.
The word Copyright should always be capitalized. It is a specific name for a specific thing.
Yes, Sunday should always be capitalized.