I saw a similar idea on Twitter by @Sailor Failures and thought it'd be a fun topic for here.  Whats your top 10 Moon and Chibi Moon items? There's quite a lot!

Here's a list (if I miss any, let me know!):

Moon's Items
Disguise Pen
Tiara
Moon Stick
Cutie Moon Rod
Spiral Heart Moon Rod
Moon Kaleidoscope
Eternal Tiare
Moon Power Tiare (90s Anime)
Holy Grail
Holy Moon Chalice
Moonlight Stick (PGSM's version of the moon stick)
Princess Harp (PGSM)
Princess Sword (PGSM)
Transformation Brooch (original; feel free to differentiate between 90s anime and manga/Crystal versions)
Crystal Star (second)
Cosmic Heart Compact (third)
Crisis Moon Compact
Eternal Moon Article (90s Anime Eternal brooch)
Silver Crystal


Chibi Moon's Items
Luna P Magic
Pink Moon Rod
Crystal Carillon
Stallion Reve
Moon Kaleidoscope
Prism Heart Compact (first)
Chibi Moon Compact (second)
Pink Moon Crystal


Phew I think that's it.  Feel free to include pics too, didn't have time to gather them all. xD

Used http://sailormoon.wikia.com/wiki/Category:Items as my source!

This was almost too easy for me
1.Spiral Heart Moon Rod
2. Eternal Tier/Moon Power Tier (Always considered them the same item, tbh)
3. Silver Crystal
4. Sailor Moon Crystal transformation broach
5.Eternal Moon Article
6.Cosmic Heart Compact 
7. Pink Moon Rod
8.Holy Grail
9.Prism Heart compact(first)
10. Disguise Pen

Oooh man this is so hard for me. But I'll give it a go xD

1. Cutie Moon Rod/Spiral Heart Moon Rod ~ especially in the manga where they grow into large staffs!
2. Holy Grail
3. Crisis Moon Compact & Chibi Moon Compact/Cosmic Heart Compact ~ I love the design of these even though for some reason the Crystal Star is a bit more iconic for me. Always loved that Moon and Chibimoon get a similar compact to transform together!
4. Stallion Reve/Crystal Carillon ~ who doesn't want a magical item that grants you a romantic dreamy Pegasusthat's secretly a hot dude to sweep you up and away in your dreams at night <3
5. Princess Sword (PGSM)
6. Disguise Pen/Moon Stick ~ both pretty iconic too
7. Crystal Star/Transformation Brooch
8. Moon Kaleidoscope
9. Pink Moon Rod
10. Eternal Tiare


actually wasn't as bad as I thought

I guess this is technically Mamoru's item, but my number one has always been the (Orgel) Star Locket~. Wait... Why don't I have one in my collection?! I can't decide which version is more beautiful though...

1. Star Locket
   
2. Kaleidomoonscope
   
3. Moon Stick  
   
4. Crystal Star Brooch
   
5. Disguise Pen {TIED} Pluto's Chibiusa's Space Time Key
   
6. Silver Crystal
   
7. Stallion Revelol agreed Brit, agreed! (I really should be saving up for this baby too...)
   
8. Luna P
   
9. Pre-Awakening Tiara in DK arc of manga/Crystal
   
10. Holy Grail
    

That was actually tough for me!! So much pretty *___*.

Also, don't ask me why but the Spiral Heart Moon Rod has always been just a "meh" for me... Even though it's born from my OTP's love woops...XD

Diagnosed wrote:

I guess this is technically Mamoru's item, but my number one has always been the (Orgel) Star Locket~. Wait... Why don't I have one in my collection?! I can't decide which version is more beautiful though...

Oooh! I didn't include the star locket cause i was going for attack and transformation items but ya know...if you go by the 90s anime standards...technically Usagi used it to heal Mamoru in the finale of the first season, so it counts, right? XD

1. Eternal Tiare/Moon Power Tiare
   
2. Moon Kaleidoscope (both)
   
3. Eternal Moon Article
   
4. Luna-P
   
5. Disguise Pen
   
6. Pink Moon Rod ( )
   
7. Pink Moon Crystal
   
8. Spiral Moon Heart Rod
   
9. Moon Stick(s)
   
10. Tiara

Yes, I like the shiny powerful stuff

1. Disguise Pen
2. Luna P
3. Moon Stick
4. Star Locket
5. Silver Crystal
6. Crystal Star Compact
7. Stallion Reve
8. Holy Grail
9. Princess Harp
10. Mamoru Chiba (Does he count?)