I have the second version, and also have Jolly Lolly, who have the same cutie mark and colors of Mittens I (you can see her here: http://mlparena.com/index.php/topic,400392.0.html )   

Have her! She's one of my favorite G3s, probably.

It's the same for me! I have her... she's beautiful!! 

So... it's happening...  My Moonstone's head is yellowing ...!  It's more evident on the left side.
And my Starshine is white when I look at her from a frontal view, but I can notice a slight yellowing on her head when I tilt her.

What a cruel fate!!    I just hope it won't get worse.

I hope someone can share some extra advice! 

G1 Seashell
G1 Seaflower
G3 Sapphire Shores
G3 Shell-Belle
G3 Island Delight

Quick! Name 5 ponies with jewels in their symbols, but NOT in 3D!!

Goldengrape
Meadow song
Berry Dreams
Bitta Luck
Cherry Fizz

Quick! Name 5 ponies with strawberries in their symbols!

I love giving new names to my ponies! Although it's not simple to coin new names (but sometimes I use existing words).
it's quite hard to understand for non-italian speakers, anyway... here they are!

G1:

Moonstone:  Stellario
Starshine:  Antares
Parasol:  Sombreila
Skydancer: Mamma Unicelo
Windy: Unicorno


G3:

Spring Fever:  Primuvella
Strawberry Swirl:  Fragolisia
Bumblesweet:  Mieldorì
PeriWinkle:  Balenia
DaisyJo:  Elinfa
Pinkie Pie:  Aurosis
Rainbow Swirl:  Sorbette
Desert Blossom:  Caliencia
Wysteria:  Liladel
Rainbow Flash:  Gaudia
Silver Glow:  Volodea
Fancy Free:  Desioara
Sapphire Shores:  Zefidra
Jade Garden:  Ireos
Spring Treat:  Tulipsa
Starbeam: Sidereya
Star Dasher: Adamanta

Updating:
Ponies are arrived today! And yes, it's the scented version! 
They are all  B - E - A - U - T - I - F - U - L !!!  although, some of their scents are... ehm... weird!  But they aren't too strong (two of them have very light scent) and, anyway, I like they are scented. I immediately removed them from the box and now I'm keeping them out in the open, on my shelves, in order to avoid yellowing... For now they are in perfect condition! At the opposite, one of the collector ponies arrived with them, is discolored!!  So, this issue doesn't regard just scented ponies... I received a Blossom with yellowed head and now I'm returning her in order to get a new one in replacement.

It happened to me too! I ordered what the seller sold as the “scented” set, but got surprised when the unscented set got here instead!
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I do think that tailrusted’s suggestion may work, since our pony room’s been cold lately, and I can barely smell the artificial scent (it’s only noticeable when you really hold them real close)

Thanks for posting this!! So, an unscented version of this gift set DO exist!!! I suppose yo've been lucky! 

I don't think the smell fading will save them from discoloration . . . What makes them discolor is whatever oil or product is put on their bodies (or possibly melted directly into their plastic).

But anyway, not all the scented ones discolor . . . I have a bunch of them because I bought extras of some (I wanted them both in and out of packaging) and out of all of them, only one (a Parasol) has discolored.  And not even very much, just a little around her neck.  And my other Parasol is fine.

The one who discolored is in her package, but others I have that are in their packages haven't discolored soooo . . . *shrug*

A lot of pony problems are related to heat, like age spots, so I would keep them out of heat in case that's a factor.

So ... from now on, let's put all ponies in the fridge!! 

Your comments reassure me... I realized the discoloration it's not so probable...