SCALENE...
That's what kind of triangle this is. (Geometry was never my forte so I had to look this up). From the 80s, it's a soft "ballet"-pink, a good quality piece of enamel on brushed gold frame. You will see that all the sides are decorative brushed gold also. Working pin back has rolling safety catch. It has no flaws. Ruler shows size. Will come in a gift box. ( a little late for breast cancer awareness-month but why just ONE month ?
ON SALE? It could be. Private sales are done here from time to time so look for a dark pink sale banner with a discount code (percentage off) on any of my shop pages. Individual items do not show sale prices during private (non-site-wide) sales.

This item is sold from an excellent, highly rated vintage boutique in Northfield, OH.