Is she someone actually referred to by Tolkien (as opposed to someone we assume has to have existed in order for King X to have had son Y)?

Is there some action or deed of hers that is particularly notable?

oooooh, shiny
 

Just clarifing, she was an elf, right?

Was she alive before Third Age 1150?

is it the wife of Eldacar?

Was she born in Gondor? No
Is she someone actually referred to by Tolkien Yup
Is there some action or deed of hers that is particularly notable? None
Just clarifing, she was an elf, right? A man ;)
Was she alive before Third Age 1150? Yes
is it the wife of Eldacar? Wrong

Did she force events of a greater disaster?

Is it the wife of Isildur?

Elendil's wife, and thus Isildur's and Anarion's mother?

Mithalwen got it.
 

Isildur's wife it is.

Your turn. :)

Third Age?

Living?

Blimey you are quick off the mark - and resisting the temptation to choose something that would require the answer no to both the answers are:

1,Third Age - Yea
2, Living - No

Cunning question Nilp :)

Object?

3, And object - yes

Weapon?

Article of clothing?

Rare object?

4, Weapon - No
5, Article of clothing - Not
6, Rare object - Judgemnet call - but I think yes on the whole..

Second Age also?

7 Second age also ? Sort of.... dunno

belonging to a member of the Fellowship?

Owned by a man?

belonging to a member of the Fellowship? No
Owned by a man?
No

But arguable....

Did it come in contact with hobbits?

Did it come in contact with hobbits? Yeah

Come into contact with Merry and/or Pippin?

Come into contact with Merry and/or Pippin? Yes

Was it in the barrow-downs?

Come into contact with M&P before the Breaking of the Fellowship?

1,Third Age - Yea
2, Living - No
3, An object - yes
4, Weapon - No
5, Article of clothing - Not
6, Rare object - Judgemnet call - but I think yes on the whole..
7 Second age also ? Sort of.... dunno
8 Belonging to a member of the Fellowship?/ 9 Owned by a man? No, but arguable....
10 Did it come in contact with hobbits? Yeah
11 Come into contact with Merry and/or Pippin? Yes
12 Was it in the barrow-downs? Nein
13 Come into contact with M&P before the Breaking of the Fellowship? Verily

Come into contact with M&P before Rivendell?

Was it ever in the Shire?

Come into contact with M&P before Rivendell? Yes
Was it ever in the Shire? Not that we know of

The green beryl Aragorn found on the bridge?

Also came in contact with Frodo and/or Sam?

Came in contact with M&P at Bree?

Come in contact with Aragorn?

Firefoot has the answer, it is indeed the gem that Glorfindel left as a token on the Last Bridge.

Congrats, Firefoot!
 

Though I think we've had that answer before. :p

Anyway...

Living?