Identification direction please?

Anyone can point to what this likely is?

RI reading says 1.772-1.773ish
SG averaging on a cheap digital scale says 2.672, with high result 2.88 to low 2.65 with another cheap scale… Its doubly refractive.
seems to me it has some needle-like inclusions and those weak internal streaks i find in aquamarine.
In UV-LW, it becomes a rather strong dull yellow color.

I will work hard on my memory and skill on gemology after the summer :wink: Life is hard and busy… Sorry, and thanks in advance!

Hi Erik, the only DR Yellow or orange gemstone with that RI range is a natural yellow sapphire or synthetic, however the. SG is way off at 4.00.
The DR gemstones that are in your SG range are
*****Yellow beryl —helilodor

Is it possible your refractometer is giving wrong readings?

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JCBellGG: Thanks alot for your reply!

I did previously visually compare it to some heliodor rough i have in my collection, and its striking similar.
The readings also confuse me, otherwise try harder to ID them myself.

They were found by a friend of mine in nature during a vacation in Croatia

Citrine measures very stable on the refractometer, so it cant be that.
The refractometer is probably an no-brand knockoff from ebay, but it has worked fine on alot of other stones previously… I did cut the reading area of the stone to get a clear reading; and its very strong and distinct at that range. Though im not experienced in how bad a refractometer can behave if poorly made.



Heliodor would make sense. You did mention that your aquamarine had similar internal characteristics which makes sense since they’re both in the beryl family. However, Ukraine is a major producer of Heliodor but I couldn’t find any info of it being found in Croatia. Both countries are in the Balkans region, so it could be a strong ‘maybe’
I’m curious to know what you find out
. Please let us know

Thanks for sharing.

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Hi again,

I manage to get a kind of reading at RI1.57 with polarizing filter… i dont know what issue the refractometer has, but its enough to buy a new one…

Smells even more like heliodor then…


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Are all of these you listed possible fluorescent under UV?

Yeah, it’s looking like scapolite

Yeah, I was thinking it was Golden beryl.

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PaulB36648 suggested testing for fluorescence and I agree

Under UV, Heliodor aka golden beryl does not fluoresce, however Scapolite shows a very strong yellow