What do the blue/purple item prices mean

smite

I've been playing Smite since they first started (/brag) and I still don't know why some items have blue or purple price tags. They seem to be discounted, but the reason eludes me. What does a colored item price mean, and what triggers them?

Edit

Here's why I was confused. When you first look at an item, it shows how much it will cost to upgrade the item completely from tier 1 to 3:

1

When you buy tier 1, it still shows the total cost to upgrade from tier 2 to 3:

2

Because you already spent 1010 gold on tier 1, the cost for tier 2 and 3 are reduced by 1010. This could be confusing to noobs (like me) who thought that the prices reflected the cost for only that tier.

Best Answer

The different color price is basically a separator, if they were all yellow it would seem a little bit odd.

The start of a game is a perfect example to give, in Assault Mode you have enough gold at the start to fully complete an item, would you rather those 3 prices be yellow? Or the colors they are now to signify upgrades?