I have made up the example below.
(1a) My grandmother will be celebrating her eight-fifth birthday in one month. I want to order a custom-made jewelry item for her birthday gift.
My non-native English speaking friends revised the phrase in bold, as shown below.
(1b) ... I want to order a custom-made jewelry for her birthday gift.
I don't see anything wrong with my original phrase. Who is correct? Please help me. Thank you very much for your time and help.