Asterism is often a star like reflection influence attributable to specific minerals throughout the host Corundum. They are microscopic acicular mineral inclusions of Unique orientation. The colourful crimson hue in rubies is attributed to moment amounts of chromium substituting aluminum in the crystal lattice of aluminum oxide. stones in alluvial https://medium.com/@thegemjournal/best-places-to-buy-sri-lankan-pukhraj-ea919f2bd00d