Purchased Gold coin from Tanishq using 25* Amex Offer

I need to spend around 35k till 11-March to complete my 4L milestone but don't have any major spend coming.

Is a 4gram gold coin from tanishq at 25* worth it?

Here is my calculation-

Cost of 22k 4gram gc - 32,748rs. Which is 8187rs/gram

MR points earned- 655(base 2%) + 8187(bonus 25%) = 8842 MR points.

At a worst 1:0.33 conversion. I get 8842*0.33 = 2,948rs.

So effective 4gram gc- 32,748-2948 = 29,800rs

So around 7450rs/gram.

PS- my main goal here was to do a meaningful spend of 32k to reach the 4L milestone on my amex plat travel card and not do a useless spend just to complete the milestone.