Practical Gemology refers to the application of the knowledge of characteristics and properties of gemstones in identification or separation of synthetics and imitations. Diamond grading is included in practical gemology.
In November 1919 and January 1920, in what notoriously became known as the âPalmer Raids,â Attorney General Mitchell Palmer began rounding up and deporting so-called radicals. Thousands of people were arrested without warrants and without regard to constitutional protections against unlawful search and seizure.
Darwin was first bombed on 19 February 1942 in an attack that lasted around 20 minutes. Although it was a less significant target, a greater number of bombs were dropped than â¦ in the attack on Pearl Harbor.The attacks were the first of about 100 air raids against Australia and the Top End during 1942-43.arwin went on to be bombed about 60 times up until November 1943. These initial attacks were the first of about 100 Japanese air raids against Australia during 1942-43. Other attacks included: Broome, on the far northwestern coast of Australia, on 3 March 1942.