Well, here's something you won't find on the value menu anytime soon: in honor of the 50th anniversary of its Shamrock Shake [1], McDonald's commissioned a handcrafted cup made out of 18k gold and adorned with 50 emeralds and 50 white diamonds — representing the green drink and whipped cream, respectively — as well as 50 yellow diamonds. Referred to as the Golden Shamrock Shake, the cup is valued at nearly $100,000.

Though it may seem like the fast-food chain is giving the Shamrock Shake a really extravagant birthday gift, the limited-edition item is actually being auctioned off for charity [2]. All proceeds will benefit Ronald McDonald House Charities, which supports families with hospitalized children. Though bidding began on Feb. 25 at just $1, at press time it's already surpassed $25,000.

The auction ends on March 6, but fortunately a second gilded cup was made, which customers will have a chance to win when they purchase a Shamrock Shake or an Oreo Shamrock McFlurry using the mobile order system on the McDonald's app. Good luck!