From FlyerGuide Wiki

Gold Member: For members who fly 45,000 miles or 10 500-mile segments in first or business class on China Airlines or Mandarin Airlines in Kaohsing, Taiwan or Taipei, Taiwan (Chiang Kai Shek Airport) during one year. Benefits include:

• Special reservation telephone and fax lines.
• Priority standby service on paid flights.
• Special gift.
• Exclusive check-in counter.
• Extra baggage allowance.
• Priority baggage handling.
• Access to CAL VIP lounges when traveling on CAL outgoing flights.
• Priority seating service.

Emerald Member: For members who fly 120,000 miles or 40 500-mile segments in first or business class on China Airlines or Mandarin Airlines during one year. Benefits include the above listed, plus:

• Private reservation phone numbers within Taiwan.
• Guaranteed seats on most CAL international flights, provided that bookings are made 72 hours prior to departure.
• Complimentary one-class, space-available upgrade for spouse when traveling with member.
• Complimentary access to CAL VIP lounges for member and a guest.