It's Rough Being a Diamond

Over the years there have been many diamond substitutes.  Zircon (Cubic Zirconium), Quartz and glass, even plastic.  But this one, discovered in the 1830's, sure looks pretty good.  It can fool the unaided and untrained eye pretty readily.  The stone is Danburite, discovered in Danbury, Connecticut but mined quite a bit in Mexico.  It's cheap because it comes in large chunks.  It comes in clear or clear yellow and even some pink.  It's only drawback is that it isn't as hard as diamond.  Diamond is the hardest substance on earth at a 10.  Danburite has a hardness of 7.  So go ahead and fool your wives.  Make a sport of it.  Give her a good sized rock of Danburite.  Tell her you've been saving your money for years to buy her this.  She'll love it, at least until she goes to the jewelry store to have it checked.  Good luck!