Izzy Collections - How much Gems to spend for Rare

I'm sure it's utterly random. I made the original purchase of 20 gems, and then I did the "try again" 5 times (16 gems per retry). I got nothing gud after 100 gems spent.

It is completely random.  If you click on the tiny question mark on Izzy's screen you will see that there is a 60% chance that you will get a common, 30% chance you will get an uncommon and a 10 % chance you will get a rare.  This chance is independent, with a separate chance for clothing style, a separate chance for visual effect and a separate chance for bonus trait.  

I had saved all of my gems and bought 15 Izzy's all at the same time.  I got 3 with rare styles, 5 rare powers and 2 rare effects.  One of the purchases was a personal favorite, a sparkly super hero costume of talent.  (rare costume, common effect and rare bonus) 

I posted too fast.  I just did 10 more Izzy's purchases.  7 were meh....two were useful and then there was this gem.  This is probably the best I could ever get, exactly what I was looking for.  The only change I might wish for is a different color.  I like the blue super suit better, but this is so awesome.    Now I have two super suits, one that is good at careers and one that is good at hobbies.

To create a new design in Izzy's fashion shop, I usually only had to spend 15 gems. All of a sudden, the price is up to 20. Im not sure if its a bug because I see other people have a price of 20 gems also. When I retry a design, I just had to pay 11 gems, and now it costs 16 gems. Was this change part of a new update that Im not aware of, or was the change for some other reason? If anyone can clarify this, I would appreciate this.

---

@TomSpeedy180 wrote:

To create a new design in Izzy's fashion shop, I usually only had to spend 15 gems. All of a sudden, the price is up to 20. Im not sure if its a bug because I see other people have a price of 20 gems also. When I retry a design, I just had to pay 11 gems, and now it costs 16 gems. Was this change part of a new update that Im not aware of, or was the change for some other reason? If anyone can clarify this, I would appreciate this.

---

For me the price has always been 20/16