What Is A Blue Star Sapphire

Tiny needles of silk within the sapphire crystal reflect light and form a star sapphire s telltale star.

What is a blue star sapphire.

This effect is caused by asterism. According to legend helen of troy owned a magnificent star sapphire and napolean gave a seven piece jewelry set featuring 29 sapphires to his wife josephine. A burmese blue cabochon star sapphire and diamond cocktail ring. You can read more about asterism in our phenomenal gems article.

The most common star pattern is a 6 rayed star although star sapphires with 4 rays and 12 rays have been found. It has a nice blue colour. The most desirable color is a vivid intense blue. A lindy star on a yellow sapphire cabochon.

Furthermore natural star sapphires rarely have perfectly even color so if the color is excellent and perfectly blue there is a good chance it was created in a lab somewhere. Natural blue star sapphire burma color. A star sapphire is so named due to the appearance of a star shaped format which presents itself when the sapphire is. The thai blue star sapphire is a variety of sapphire that displays a six pointed star pattern radiating from the inky depths of the stone.

The really deep blue ones are the most expensive although if you see a twelve pointed star these are more rare than the six pointed star that usually puts the price up by quite a lot. The optical phenomenon responsible for the star sapphire s shimmering rays is called asterism from the latin word astrum for star. Star sapphires display a 6 or 12 rayed star on the gem when a single light source is directed on the gem. These stones are generally cut as cabochons to bring out the best star that can be visible.

Star sapphires occur in almost every color seen in transparent sapphires although yellow orange and green star sapphires are very uncommon. Al2o3 corundum aluminium oxide cut. Star sapphire is a type of sapphire displaying an optical star like effect. 9 hardest after diamond formation.

This effect is caused by asterism. Most star sapphire exhibits a white star but star sapphire from thailand is famed for its gold colored asterism. A blue or white star sapphire or a pink star sapphire are usually more expensive and get into the thousands of dollars. Move star joan crawford owned several huge sapphires of 70 carats or larger and elizabeth taylor was given a large sapphire ring by one of her husbands.

Formed by what is commonly known to be needles in the gemstone industry the star seen on a sapphire tends to be more valuable when the rays are.