Jeweler franchise provides an array of diamonds, sapphires and other precious stones for all occasions.. In Short International Diamond Center has been serving its clients for over 20 years. The jeweler primarily sells diamonds but has other gems available, too. Know the five C's-cut, color, clarity, carat weight and certification before making a purchase. The business provides customers with a quality chart, which gives people an idea of what to look for when purchasing a diamond. Sizes include round, princess cut, pear, emerald, marquise, oval, cushion, asscher, criss cut and heart.