Message:

<p>[QUOTE=&quot;Ce BCA, post: 4495207, member: 18716&quot;]I think you may be mis-interpreting the meter, the labels above the black bar (garnet, tourmaline, iolite) suggest all these gems will normally fall in the range of that black bar.&nbsp; How high or low in that bar depends on many factors, and any of them could be at either end of the bar, middle doesn&#039;t mean tourmaline, it could be anywhere in the range.&nbsp; Also these presidium meters are very unreliable so they only give a rough guide, you need other tools to make a positive diagnosis.&nbsp; They are pretty good at finding ruby, sapphire and for the most part topaz, but outside this I don&#039;t trust it at all as it&#039;s often wrong.</p><p><br /></p><p>For example the size of the gem often matters, larger gems usually test higher as they have more initial thermal inertia.&nbsp; Quartz also tests differently depending on the axis, the same stone can give quite different results depending on the axis you test.&nbsp; The surface finish also affects results with better polish giving a higher result compared to a rougher finish.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in