The sapphire is one of varieties of corundum., Although blue is their most well-known color, sapphires may also be colorless, and are found in many colors.￼
Pink sapphire, the deeper the pink color the higher their monetary value.
Padparadscha sapphires often draw higher prices than many of even the finest blue sapphires. Padparadscha is a pink-orange corundum.
A star sapphire is a type of sapphire that exhibits a star-like phenomenon known as asterism; red stones are known as “star rubies”.
^ Arthur Thomas (2008). Gemstones: properties, identification and use. New Holland Publishers. p. 226. ISBN 1-84537-602-1. ^ Richard W. Hughes (1997), Ruby & Sapphire, Boulder, CO, RWH Publishing, ISBN 978-0-9645097-6-4
click image to enlarge