This abacus ring is based on a traditional Chinese abacus(suanpan), 2 top + 5 bottom bead configuration. Works for decimal and also hexidecimal numbers. There are stories of people that can do complex calculations on an abacus faster than another person using an electronic calculator.
Pinky ring not for you? Try the slide rule bangle bracelet instead.
DISCLAIMER: Not yet approved for use on SATs or any other standardized testing.
Step 1: Getting crafty...
You will need metal crimp beads. I picked the smallest size they had at the craft store because I wanted the abacus to be small.
Although the beads look tiny, when they are on the frame, they can still be easily manipulated with just your fingers. Assembling the abacus was another story.
Head pins or thin stiff wire. These are probably stainless steel or some kind of alloy steel that solder sticks to. You could use brass or copper wire for a different look. Gold plated hardware might be available.
You will need the usual soldering tools and a fine tip soldering iron.
Since this is in contact with your hands, use lead-free solder. As with all jewelry in skin contact, know if you are allergic to anything.
Have a nice pair of wire cutters to trim the excess wire after soldering.
I used masking tape to hold down the parts as I soldered.
You might want to work under a magnifying unit to do the soldering on the close joints. Not as bad as SMT soldering but still a little tricky as all the parts want to move independently.
You might want to work in a nice, well lit, clean, clear of obstruction, well ventilated and flat working area. Wait, who are we kidding?
CAUTION: Parts are tiny. Many will end up on the floor somehow. Vacuum afterwards. Same goes for the tiny metal shards that you clip off when your trim your solder work. Solder fumes are bad for you. Soldering irons and freshly soldered parts are hot.