(jagfan), which you can find in the comments below, said it looked like a stingrays mouth, and I most heartily agree.
With out further ado I present to you the Manta Ring, which I just realized I had already typed at the top, so yeah!
1.) Intro: Alright if you haven't seen this Instructable before, basically its similar to the original (quarter ring) seen almost every where, with a slight difference; The ring has what appears to be a large stingray mouth, or whatever your imagination can stir up.
This will give you the tools, and know-how to create a ring. Follow the instructions carefully, and you might just turn out a mantapiece. :)
Warning: If you have a quarter that was minted before 1965, it is made of silver and is worth more than 25 cents.
Laws:Section 331 of Title 18 of the United States code provides criminal penalties for anyone who “fraudulently alters, defaces, mutilates impairs, diminishes, falsifies, scales, or lightens any of the coins coined at the Mints of the United States.” This statute means that you may be violating the law if you change the appearance of the coin and fraudulently represent it to be other than the altered coin that it is. As a matter of policy, the U.S. Mint does not promote coloring, plating or altering U.S. coinage: however, there are no sanctions against such activity absent fraudulent intent.
Step 1: Tools
Tools: Mandrel - $10
Punch and Die - $45
Sledge Hammer - $10
File - $2
Drill - $25
Quarter - 25 cents