Notice: wpdb::prepare was called incorrectly. The query does not contain the correct number of placeholders (2) for the number of arguments passed (3). Please see Debugging in WordPress for more information. (This message was added in version 4.8.3.) in /home/clients/29ac0a41d75676ae892e797b3ed6b38f/web/wordpress/wp-includes/functions.php on line 3668 Images - Scientific Visual
Illustrating sapphire defects and their morphology
To view image in full resolution, click on thumbnail.
Some image captions refer to sapphire clarity grading from 1 (defect free) to 4 (highly defective) used in the industry.
A description of the sample is found at the bottom-left of the screen.