Listed

Amazon's price on the product page, already its own discount off MRP.

Coupon

Amazon's Gold coupon, clipped on the product page. It is a jewellery coupon – it applies to Vedhani rings, pendants, chains and the like, not to coins and bars – so a coin row shows "n/a" here. Comes off the listed price first.

Card

The instant discount for the card you picked, worked out on the price after the coupon. Every card offer is capped in rupees, so the same "10%" is worth less on a heavier piece. EMI-only offers are not shown.

You pay

Listed − coupon − card. The two stack; that is the whole point of the board.

Per gram

What you pay, divided by the piece's gold weight.

Needs

The total discount off the listed price that piece needs before it is worth more than you pay. A row is marked when your stack beats it.

Difference

Metal worth minus what you pay, at the rate and haircut you set. 22K is valued at 91.6% of 24K. Jewellery carries making charges, so it needs a bigger stack than a coin to clear.

Data points, not advice. Prices and offers move; check Amazon before buying. Rates from Karat Board.