Choosing gold pantone colour for print on transparent plastic. Help pls

@moty5DDA as @Test Screen Name advises, you must work with the printer. Printing on substraits such as plastic, metal, wood, and vinyl often requires a very specific Pantone "family" of colors as explained on their website Pantone Color Systems - Introduction | Pantone. Don't guess what this might be. A gold color in one is not the same as another. 

What's more, the color may be named the same across systems. A sign fabrication project I helped someone with found this out the hard way. They were only given the name "Cloud Dancer" and so they went ahead with that color in the textiles family. Turns out when applied to the sign, the color was noticeably different. Sometimes, what you see on screen or paper is not the color that will reproduce on an end product.

Packaging design commonly uses spot colours and non-ink treatments. You need to liaise closely with the package printer to discover what colour libraries they support (because it's about buying buckets of ink), and what technical limitations; whether they use CMYK at all etc. etc. There is no general advice (except to ask them!) It is quite impossible for you to do this work in isolation and send a file ready for the jar printer to work with. 

In Photoshop use the Color Picker.  Click on Color Libraries.  Select desired Pantone Book from the drop-list (Pantone, Pantone+, Solid coated, Solid uncoated, etc...) see screenshot.  Also refer to the Pantone Color finder online.

https://www.pantone.com/color-finder

Hi

Can you tell us which Adobe application you're referring to so we can move the thread to the correct forum