Royal Jordanian
Royal Club tiers are earned on qualifying miles or segments over a 12-month period on Royal Jordanian and oneworld carriers. Royal Jordanian is a oneworld member, so Gold is Sapphire and Platinum is Emerald. Confirm current thresholds on rj.com.
4 rungs, from the bottom up.
Qualification thresholds are the published ones as last checked and change most years; confirm the current numbers with Royal Jordanian. Alliance equivalences and the lounge rules that follow from them move far more slowly.