Sapphires

are the special event currency in My Little Pony.

Battle with Dragons
This event introduced sapphires for the first time. They were removed at the end of event.

Obtaining
Dragon lair appeared in Ponyville to the right of Crystal Mine, and was spawning dragons each 3 hours (could be skipped for up to, depending on time remained). Each dragon could be defeated using shards of Harmony and dropped about on average.

Additional could be earned as the event reward ( for scoring 150 points and  for 550 points).

Sapphires also could be obtained from sapphire-priced Balloon Pop available during event, though it barely could be considered as an effective way to earn since they were an uncommon prize and successful pop could yield only  while the game costed  (or  with 50% discount in the end of event).

Uses
Sapphires could be spent on several characters and items: They also could be used to play event-exclusive Balloon Pop, as mentioned above.
 * Ponies
 * Comet Tail
 * Daisy
 * Lily Valley
 * Purple Wave
 * Randolph the Butler
 * Royal Pin
 * Shooting Star
 * Sunny Daze
 * Shops
 * Fabric Shop
 * Honey Stand
 * Sports Shop
 * Friendship Lake, decor item for Ponyville