4
$\begingroup$

i got this pendant and i want to know if it is natural turquoise or not Please help me thank youenter image description here

$\endgroup$
  • $\begingroup$ Please edit your question, follow this guide to add more information. $\endgroup$ – gerrit Jul 17 '17 at 13:24
8
$\begingroup$

The pendant might be dyed howlite, a common fake for real turquoise. The most distinguishing tests are destructive.

Hardness test: (THIS IS A DESTRUCTIVE TEST.) A steel knife blade will easily scratch howlite which has Mohs hardness value of 3.5 Turquoise has Mohs hardness of 5–6 BEWARE: Knife blade can still scratch turquoise. YOU HAVE BEEN WARNED.

Dye test: THIS IS ALSO DESTRUCTIVE TEST. If the pendant is dyed howlite, take some acetone or nail polish remover, and use a q-tip to apply it to the back of the pendant. If the q-tip picks up some blue color or exposed surface becomes dull or white, the piece is howlite. YOU HAVE BEEN WARNED.

There is only a slight difference specific gravity between howlite (2.53 to 2.59) and turquoise (2.6 to 2.9). Light weight cheaper quality turquoise may have the same specific gravity as howlite.

Best thing to do, take it to a lapidary shop or gem shop. A gem expert can tell howlite from turquoise by physically handling the piece and closely observing the color variations.

References:

Mohs Hardess Scale

Howlite vs Turquoise

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.