inclusions

[1bwana1]

These two pictures that you posted earlier show surface scratches. These are what is based my mention of this on.

If you want to continue working with stones I strongly suggest you invest the time and minimal money required to get some gemmology tools. A refractometer, polariscope, dichroscope, hand held diffraction grating spectroscope, are the minimum I suggest. It looks like you already have a microscope and UV source.

I also suggest you try and find a copy of the GIA Lab Manual. GIA will not sell you one, for registered students only. But they often come up for sale on both Amazon and Ebay. The manual has excellent instructions on how to use all the equipment, and provides a good workflow to arrive at positive identification of gemstones. Well worth the time and money invested.

[Bobby]

Thank you for suggestion.I will definitely try to get the equipment.Spent so much on labs and some stones turned out great most were a waste of money.Best i invest in gem equipment.

[Barbra Voltaire, FGG]

Specific gravity (3.5) would rule out scapolite.
The stone fluoresces RED w/ LWUV?
Have you considered synthetic spinel?

[Bobby]

Showed it in a jewelry store in dubai and the experts there said its a diamond but the fluorescence put them off..said it might be lab grown .tom taking it to a lab ..

[Barbra Voltaire, FGG]

Gee, how did the "expert determine diamond? What instruments were used.
Fluorescence? LW? SW?

The inclusion photos and info you post are insufficient for identification. How confident are you with your specific gravity info?
Lets start with some real data.

Polariscope You can rig one up yourself with crossed polars
Singly doubly refractive? Interference figure?
https://gemologyproject.com/wiki/index. ... olariscope

Dicroscope: London dicroscope is cheap
Pleocroism
https://gemologyproject.com/wiki/index. ... ichroscope

Fluorescence Get a light which emits both LW (365nm) and SW (254nm) with calibrated units. Wear goggles fro SW
https://gemologyproject.com/wiki/index. ... uorescence

Magnification:
Start looking at fracture surfaces, not inclusions

Types of fracture are:

Conchoidal (shell like) which results in concentric concave ridges
Subconchoidal, which is similar to conchoidal but less prominent, often lacking the concentric ridges.
Even. A fairly smooth, flat break that may visually resemble a cleavage plane.
Granular. A fine-grained break resembling the surface of a sugar cube.
Spintery. A fibrous break that resemles splintered wood.
Uneven. A general catagory used to describe fractures with an irregular appearance such as aggregate gem materials like Serpentine.
Steplike. Breaks that may be a combination of cleavages in more than one direction or a combination of cleavages and fractures.

[Bobby]

Sorry i took time to reply.They checked the flouresence and it dint register on a diamond tester and i never thought about diamond and i know nothing bout it.They just looked in through loupe and a spectroscope .I did buy a hand held one now but have no idea how to use it .am trying to study about it a little.I did take it to a lab but the stone being 14.6 carat was too expensive and is a lab grown diamond worth anything to pay so much .So im just going to try the spectroscope and post what i find.Theres one more small pink gem and a few yellow ones .ill post the pictures and what i see in the spectroscope.Thank you barbara ..im going to get to that link you sent me and study that stone.

[Bobby]

I have purchased these three hopefully this will show something.These are the other stones that came with the green stone and i just could not understand what they were.

[Bobby]

The green stone and the pink are dark throughout in polarascope.From what i read its called isotropic.Now what i see in spectroscope for green stone.First a band in blue ,then another band ,then a sharp black line in blue green border.Then another band in green yellow and another band in orange red area..Totally 5 lines.
The pink,one dark line in blue green border,then double line in center of green,one more dark line in green yellow border.Then in orange red there is double line.There does seem to be one line in center of blue area but not very clear..The others are dark clear lines.
This is so interesting.Thank you barbara.Now what this means i do not know but will read ..I used incandescent light,hope thats ok.

[Bobby]

The yellows are pretty confusing .In polarascope certain parts go dark light not whole stone and its not very clear.so i did check under dichroscope.They have same color .Under the spectroscope one line is very clear that is in blue green border.Rest of lines im not sure I need to check again.

[NavneetGems]

Quick Guide to Identifying Your Greenish-Yellow Gem

Examine the Inclusion

Look for shape, color, and type (needle, crystal, liquid, or gas bubble).

Check Physical Properties

Hardness: Scratch test if safe.

Refractive index & pleochroism: Use gem tester or observe color changes.

Specific gravity & luster: Helps narrow options.

Consider Color & Possibilities

Greenish-yellow could be peridot, demantoid garnet, chrysoberyl, sphene, or tourmaline.

Some inclusions are diagnostic (e.g., “horsetail” inclusions point to demantoid garnet).

Use Magnification

A 10× loupe or microscope helps distinguish inclusion type.

Seek Professional Confirmation

For certainty, a gem lab can test RI, SG, spectroscopy, and internal features.

[Barbra Voltaire, FGG]

We are putting the cart in front of the horse with these pictures.
The first requirement is to positively identify the gem featured. Some inclusion types are specific to the gems which contain them. Most others are not.
Description of Inclusion types:
https://www.gia.edu/gems-gemology/summe ... -unearthed



Gemstone Inclusion by Mineral

[danielle]

Oh! Thank you so much Barbra ! These links are a beautiful present .