Handmade Beaded Gemstone Silver Leather Tribal Jewellery

diamond (n) the hardest naturally occurring mineral. It is a gemstone whose hardness and transparency make it highly desirable in jewelry making. Diamond is an allatrope of carbon.

dichroism (n) the splitting of a beam of light into two beams of differing wavelengths.  As the two beams have different wavelengths they produce different colours.

double refraction (n) the splitting of a light wave into two upon entering a non-cubic mineral.