Pale Blue
Posted in art supplies on 10/30/2004 09:29 am by admin
Pale Blue
Blue Sapphire - Gemology and Buying Guide
(c)Copyright 2009, CaratExchange.com
Gemology and Color: Blue is the most well known color of sapphire. Sapphire belongs to the corundum group, the members of which are characterized by their excellent hardness. For blue sapphires, the intensity of blue as the most important value factor. The most prized colors are intense, rich blues that are not dark or inky.
Sources: Most sapphires come from Thailand, Sri Lanka, Madagascar, Tanzania and Australia. The United States, Cambodia, Nigeria, Kenya and China also produce some sapphires in smaller quantities. Some of the most famous sources for sapphires are the Kashmir region of India, and Burma however production of stones from these areas is becoming more limited.
Treatments and Care: The most common treatment for sapphire is heat treatment. Some blue sapphires may also be diffusion treated, though this treatment is more common for star sapphires. Beryllium treatment is now being used to produce stunning orange and red colors which were once rarely seen. Thanks to their hardness, sapphires are easy to look after, requiring no more than the usual care on the part of the wearer. Clean with mild dish soap: use a toothbrush to scrub behind the stone where dust can collect.
Buying Guide: Like diamonds, sapphires are graded on color, cut, clarity and carat weight. The ideal color for sapphire is a rich, medium tone of its primary shade - for example, blue with no hint of green or red. Pale blue sapphires that have no overtones of other colors also rate high on the grading scale for gems. Because of the wide variety of sapphires available, describing the grading process would take nearly a book. The most important factor in choosing a quality sapphire is in finding one that is attractive to your eye.
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What bird has pale blue egg 16x12 mm, with almost all 40 to 60 dark brown spots scattered at broad end?
Egg found on ground, in mid-June, Ithaca, NY -- near feeders, but not under them. Blue color is a bit duller than Robin's egg blue. Spots are varied in size, some being very tiny, others being 1 mm across. Only two brown spots noticeable on pointed half of egg.
Eggs of birds using feeders do not match this egg.
a robin!
Carl Sagan - Pale Blue Dot
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