There used to be 4200 diamonds sale offer for 19.99. How about reviving that and btw if you always show a price and amount all the time that isn't a discount. That is the real price
It doesn't actually say it's a sale. They offer a "bulk" discount for buying more diamonds at one time over the cost you'd pay if you bought them 500 at a time. That's pretty standard.
2400 (not 4200) for $19.99 is a standard offer you can get any time. If you have bought lots of diamonds in the past, they tend to show you page 2 of the buying options. Maybe that is what you are seeing?
They do offer sales occasionally, somewhat at random, when the discount is even higher. Those generally appear when you log in, but if you have bought recently, you don't get the sales offers very often.
When i was buying, I found it better to budget $20.00 a month but not spend it, then buy the largest number I could when they offered a 200% discount after a few months.