This feature is typical of beryllium-diffused sapphires (or theoretically any rutile-bearing sapphire heated at high temperatures for long periods). Rutile breaks down, and the titanium from it diffuses into the surrounding sapphire, coloring it blue.
Users browsing this forum: No registered users and 13 guests
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum