Hi,
Trust you are well :)
I have gone through your post & I can surely help you to develop POS for a jewelry shop.
Relevant Skills and Experience
I have expertise in developing applications using C#, ASP.NET, MVC, PHP, Xamarin, IoT, Power BI, Reactjs, Angular Js etc.
Proposed Milestones
$3750 MXN - Final
Which type of system you wanna need? web or desktop?