I need help to identify these gemstones.

[Qenan]

I have found these stones on the riverbed, one is 10 carats and the other is 2 carats, they are cuttable,they have hexagonal shape, I asked an appraiser he told me they are precious, but couldn't exactly tell what they are, I did a research on internet and i couldn't found yet,I did a specific gravity test and sometimes it shows sapphire specific gravity sometimes not. I would appreciate any kind of help.

 

[whitewave]

It could be river calcite maybe. Try posting it on the colored gemstones forum. In what geographical area were they found?

 

[Qenan]

Thank you whitewave I will post it on the colored gemstones, few things got me interested about this stones, the first is that I live in Macedonia the country which is on the top countries in the world for ruby mines, another thing is its shape, and few others.

 

[Texas Leaguer]

If you are in an area that is known to produce corundum, they could be white sapphires. They could also be quartz. My guess is not calcite as it is a bit too soft to have survived the erosion of the gravel bed. They could be topaz or any number of other minerals. A good specific gravity reading should eliminate most of the possibilities.

 

[Qenan]

Yes Texas Leaguer ,thank you for the advices.