by diamondmad » Dec 27, 2016 Hi, I have a triangular yellow gold pendant with an opal center. I would like to add 3-4 very small diamonds on two of the sides of the triangle. What is the best way to do this - buy the diamonds (on ebay, for example) loose, or buy a second hand ring that I can use the diamonds from.............. I am looking to do it on a budget! Thanks for suggestions.