Lounge Access for International First Class: Customers who present an International First Class boarding pass, regardless of the Star Alliance carrier they fly, have lounge access. They and one guest, are welcome to visit first class lounges or any other members' departure lounges when departing on a Star Alliance flight. Note: AC, BD, OS and SK do not have international first class service.
Lounge Access for International Business Class: Customers who present an international Business Class boarding pass, regardless of the Star Alliance carrier they fly, have access to all members' designated business departure lounges. Guests are not permitted.
Star Alliance Gold card holders and one guest, have access to any lounge around the world that is identified with a Star Alliance Gold lounge sign when departing on a Star Alliance flight, no matter which class of service they travel in. Just look for the Star Alliance Gold sign outside the lounge and present the ticket for your same-day Star Alliance flight, your boarding pass and your frequent flyer programme card featuring the Star Alliance Gold logo. Guests must enter the lounges with an eligible Star Alliance Gold member and must depart on a Star Alliance member airline, but may travel on a different flight.
Eligible Guests
Any guest of an eligible customer (International First, Star Alliance Gold card holders, and eligible paid member) must enter the designated lounge with the eligible customer. The guest must also depart on a Star Alliance carrier, but may travel on a different flight.
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Certainly in Singapore itself, SQ doesn't allow *A J pax into its own lounges, rather directing them to what it calls a Star Gold lounge, which is much lesser. Good luck.