Do You Recognize this Gemstone?

by Joyce Glazebrook.

I often go to gem and bead shows and I kick myself when I come home with a strand that I failed to identify the kind of gem or bead it is.

I had the same issue with the beads used in these earrings. The stone is a light green with some black running through it. Any idea?

I would be glad to receive feedback. Thanks for all your help!

Joyce Glazebrook
Jewelry Designs by Joyce

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  • Bunny says:

    It’s called prehnite (pronounced pray-nite, I believe).

  • Thank you Bunny! I took your information and viewed some pics on google. I believe you are right. That’s the closest I’ve come to finding something that looks like it. Your information is welcomed! Thank you!

  • Drake says:

    I don’t think that’s Prehnite. Most prehnite is sort of a dull yellow color. I believe the stones are Tourmilated Quartz. They are basically cloudy quartz crystals with needles of Black Tourmaline included.

  • Lisa Yang says:

    I also think that it’s prehnite. Higher grade prehnite is solid without the inclusions. I have prehnite that looks just like this. (But my second guess would be tourmalated quartz too). I think it depends on the color tone of the stone – if it is greenish – I’d stick with prehnite. If greyish white – the tourmalated quartz

  • Thank you all for your input! It is hard to tell from a picture, if you saw it in person you would see more green so I am betting on prehnite. I am going to try to make it to the local gem shop and run it by them as well. I will let you know the final verdict.

    Thank you so much!

  • Just got back from my trip to the Rock Shop. Found that they closed and went out of business! Sad to hear, seems that the economy is affecting us all. Thanks all for your comments….

  • cindy says:

    I do believe it is prehnite.

  • If these are the same stones shown in the necklace below, then these are rutilated quartz. The stones have needle-like inclusions.
    Gold Flower Necklace
    Gold Flower Necklace2

  • I am leaning toward prehnite, the stone have a true green rather than a quartz look. I do appreciate the assistance! Beautiful necklace!

  • Drake says:

    They definitely aren’t Rutilated Quartz. Rutile is a gold-colored mineral, I work with it all the time. The inclusions in the stones she is showing are very clearly dark-colored. They look black and needle-like to me, which is why I maintain tourmilated quartz. While Prehnite is a possibility, it is typically available as a milky-yellow stone without any inclusions.

    Rutilated Quartz

    Tourmilated Quartz


  • Hopefully a picture of the rest of the beads will help. Your thoughts?

  • Drake says:

    Now that photo definitely looks more like Prehnite. I see very few of the needle-like inclusions, and more of the blotchy inclusions that you typically see in prehnite. And those stones have a definite yellowish cast to them. I wonder if the background on the first picture made the stones look less yellowish. I wonder if the needle inclusions are still black tourmaline or something else…

  • Annette says:

    Yes, I agree its prehnite. I have it with and without the needle like inclusions.

  • Prehnite it is! Thank you all so much! It is so nice to see how helpful you all have been.

  • Christa says:

    I think its prehnite or rutilated quartz, it’s hard to tell from the picture. Prehnite is like a pale green and rutilated quartz is more clear.

  • Sandra Litva Moran says:

    I have to say that the inclusions are almost definitely tourmaline, making this stone Tourmilated Quartz. 🙂

  • This looks to me like rutilated quartz. The needle-like dark lines are
    rutile crystals.

  • Google “rutilated quartz” in Images. The dark lines in tour stones are rutile crystals. (Rutile is not golden, though the quartz it is embedded in may often be.)

  • Diane Smith says:

    I agree that the markings in the stones look to be rutilated but I also agree that they are Prehnite. I have beads that look exactly like these. Most of the time when I purchase Prehnite, there have been no rutilation streaks in the beads and they are a solid color soft green color. However, Prehnite comes in both non-rutilated and rutilated varieties.

  • Sue says:

    Hi. There is a thing called tourmalinated quartz that is clear with black lines, just FYI. If it is green, it is prehnite with inclusions, probably tourmaline as well.

  • I was able to confirm that these are indeed prehnite. Thank you all for your input and taking time to respond.

  • Diane Smith says:

    Joyce ~
    I’m glad you were able to confirm the stones to your satisfaction. Thanks for following up here to let us know.

  • I think these are moonstones with inclusions of tourmaline, so tourmalated moonstone. Anyone agree?

  • Kathy says:

    It looks like rutilated quartz to me.

  • This gemstone has been confirmed to be Prehnite. I also just attended the Rings and Things bead show and they has the same gemstones which also assured me 100%. Thanks all for your feedback and willingness to assist.


  • Liz Brummond says:

    Late to the conversation — to me, it could be prehnite but it also looks like moonstone, grade B-C labradorite or smoky quartz (if the latter, a great specimen!). Plus, whoever finished these stones did a wonderful job. I’m envious of your find and think they are gorgeous. If it helps at all, here’s a link to a prehnite donut I created:

  • Stef Fini says:

    I have some pale green tourmaline, with black inclusions, but they could be tourmilinated quartz, as well.

    When I first started lenring gemstones, any quartz with a long, skinny shard of color was called rutilated, regardless of the color of the inclusion. I believe it’s just that much easier to say than “Tourmalinated”.

  • Looks like prehnite to me. I buy and sell it as prehnite. Higher quality prehnite does not have inclusions.

    I landed on this post looking for information on just what these inclusions are. The best information I’ve found so far is on the Mindat forum:

    So far I’ve narrowed it down to tourmaline or epidote. Won’t know until someone tests it.

  • Crissy says:

    When I first saw your topic, I thought it looked like Rutilated Smokey or plain Quartz..

    Both have the same characteristics as the stones you’ve shown.
    here’s a couple of links that may help..

  • Sue says:

    I believe it’s Prehnite with rutilated tourmaline. Several different stones can have rutile needles of different materials, including the most common, which is quartz. Quartz can be seen with the black tourmaline rutiles and even golden hairlike needles but all are considered rutilated quartz. Peridot can have rutile and is more rare an expensive. Moonstone’s adularescence is causes by very fine rutiles, as are the stars in star sapphire and ruby, and the catseye in catseye materials. It just depends on the thickness and how the rutile lie and what they are made of as to what type of phenomena they produce, if any.

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