Can someone identify the light yellow/greenish stones

[Cynthadia]

Someone (very helpfully) suggested that I post this broach in the colored stones section. So, here it is.

A gemologist identified the center stone as an emerald (thinks Russian). The green stones surrounding the emerald are Dematoids (identified by horsetail inclusions). The pink stones surrounding the Dematoids are pink sapphires. The white stones are diamonds. What gemologist can't identify are the yellowish/greenish/pale stones down the middle and to the sides.

Any ideas?

 

[marymm]

Any chance they are grossular garnets?

 

[VapidLapid]

a gemologist who cant identify stones,
and defers to the collective wisdom of this forum?
PRICELESS

 

[Pandora II]

A gemmologist or a jeweller? I'd be amazed if a gemmologist couldn't ID a stone - that is their raison d'etre!

Pretty brooch btw!

 

[motownmama]

Sorry if I missed this, but where did you get it?

 

[artdecogirl]

A gemmologist or a jeweller? I'd be amazed if a gemmologist couldn't ID a stone - that is their raison d'etre!

Pretty brooch btw!

Ditto that! You might want to search out a new gemologist. But aside from that the brooch is stunning, your partners family has some awesome pieces! Could they be a lighter peridot?

 

[minousbijoux]

What about chrysoberyls?

That is a beautiful piece of art!

 

[T L]

My first thought at looking at the small stones, without even reading all your post, was "demantoids." They are usually tiny, and from Russia, if that is an older piece. However a GOOD (notice I stress the word "good") gemologist should be able to determine for sure. Perhaps they are more yellow demantoids.

 

[LD]

I wouldn't say demantoids because the ones in the brooch are very light and quite yellow - they could be demantoids but I suspect not. Chrysoberyl or a mint garnet would be my guess.

 

[kenny]

I wonder if we are being unfairly harsh on this gemologist.

Did you pay this gemologist examine the piece in their lab, or did you just happen to wear it at a dimly-lit night time party where you ran into the gemologist who had no optics or tools with him/her?

Do gemologist even need need optics or tools to do their job?
Are they expected to be able to identify anything in, say, candlelight at a glance while the piece is hanging on your necklace with no tools or optics?

 

[T L]

I wonder if we are being unfairly harsh on this gemologist.

Did you pay this gemologist examine the piece in their lab, or did you just happen to wear it at a dimly-lit night time party where you ran into the gemologist who had no optics or tools with him/her?

Do gemologist even need need optics or tools to do their job?
Are they expected to be able to identify anything in, say, candlelight at a glance while the piece is hanging on your necklace with no tools or optics?

Good questions. I also think many of us are harsh on gemologists we are unaware of, as so many of us had ones that were not very knowledgeable, and only visually id without instruments or minimal instruments ( a loupe for example ). It's always important to stress that you obtain a very thorough gemologist who is familiar with stones other than sapphire, emerald, ruby and diamond.

 

[LD]

He knew enough to be able to see horsetails in the Demantoids so potentially ID'd them from that. So he obviously knows something about coloured stones - having said that, the Demantoids are not very big so I'm surprised you would see horsetails.

 

[Pandora II]

I've seen horsetails in very small demantoids so not totally improbable.

Agreed that it depends where you saw the gemmologist. If it was in a store and they agreed to look at the piece in a professional capacity then I would expect them to ID everything. They should definitely know about stones other than the big 4 if they have been properly trained and are staying abreast of current research and thinking.

If you met someone at a party who happened to be a gemmologist and took a guess at what the stones were then fair enough, only so much can be told using a loupe and nothing else.

There are lots of things those stones could be...

 

[PrecisionGem]

It's difficult to ID stones while they are set, since one of the most diagnostic tests is a refractive index reading, and with a prong set stone, unless the table is higher than the prongs it's not possible with out removing the stone. To look at the spectra of the stone in this case they would need to be removed too. So really you are asking someone to identify the stones just by looking at them for the most part. That's kind of hard.

 

[Pandora II]

It's difficult to ID stones while they are set, since one of the most diagnostic tests is a refractive index reading, and with a prong set stone, unless the table is higher than the prongs it's not possible with out removing the stone. To look at the spectra of the stone in this case they would need to be removed too. So really you are asking someone to identify the stones just by looking at them for the most part. That's kind of hard.

Would you not just shine a light through from behind to get a spectra? That's how I've done it with set stones - that is if they give a spectrum in the first place!

 

[PrecisionGem]

With the cluster of stones that may be difficult.

My spectrometer is a the System Eickhorst with a light source. It turns out the most effective way is to get the longest light path, which means shining the light through the pavilion, bouncing off the table and back out the pavilion. This picture illustrates this. It would be had to do this in the stones mounted like in the piece in this thread. The table needs to rest on the small glass surface.

 

[Pandora II]

Ah, I see the problem with that monster! Fab spectroscope!

I prefer to use a little OPL handheld and transmitted light rather than using reflected light unless I'm doing opaque stones. I have a mini flexi-light rather than a pentorch so it's not too hard to get it under settings. On this piece it seems that there's a decent size of hole under each stone.

 

[PrecisionGem]

The fibre optic can be removed, and the the light will come up through the bottom of the stone. The light source on this "monster" is really fantastic.

With the set up above, it's not reflected light. The light goes through the pavilion, then bounces off the table, and back out through the pavilion. This way you get a longer light wave travel, and a more defined spectrum.

 

[Cynthadia]

The gemologist is a very nice and I believe competent guy. I actually felt sorry for the guy because I don't believe he expected to see the collection that we brought in. Just to give you an idea of the collection, there was over 700 grams of gold, and that doesn't even include the platinum stuff. Some of the pieces...

Gold coin bracelet: 56.14 grams
Angel skin coral ring: 21.22 grams
Natural pearl ring: 20.85 grams
Ruby & red enamel ring: 21.80 grams
Black sapphire ring: 17.26 grams
Single diamond (1.8k) ring: 19.47
2 natural pearls/6 diamonds bracelet: 48.77 grams
Pave diamond bracelet: 21.58
Opal & pave diamond bracelet: 20.67 grams
Turquoise, pearl bracelet: 24.08 grams

I'm going back to the gemologist this Friday so that he can take some pictures. I'll post them as i can.