I have cut opals for many years and the only opals that have been in water are Mexican opals which can dry out in a matter of hours.Maybe some...
Misconception caused by something someone without experience of the opals in question. Spencer opals can craze and it is the reason most are made...
Is it an authentic/relic vase with a misaligned seam?Every inlay near the seam is misaligned...very strange.
Sunlight itself won't cause cracks and natural heat won't either.The first opals found in Australia outback were on the surface for possibly...
ink blotter
It looks like a "fresnel" lens from a lighthouse ,but the optics aren't right.
In a pie tin you can cut and polish most opals.Opals still in their settings in many cases can be sanded and polished without removing the stone...
It's easy enough for a 12 year to do in a pie tin while while watching tv. [MEDIA]
He should be locked into "stocks" for at least a week and suffer public humiliation. http://www.tylisaari.com/medieval/glmf03/punish.htm
The inexpensive gloves used when applying wood stain works well,the price of the Opticon is high if only trying to seal one stone.There is no need...
Opticon is as easy to use as any other 2 part epoxy.Put the opal in a small container,cover with opticon,place heat lamp above the opal to warm...
Oil is one of the worse things you can do to an opal.The only good treatment of crazed opals is Opticon fracture sealer....
Greek letters
No one can tell from a photo,too many similar looking stones ...see link...
The US has been using 925 since the 90's in most cases.The designer I worked for started using 925 in the mid 90's, they were marked...
In the USA if precious metal objects are marked for content... i.e. 925,14K etc. they must also be marked with a maker's mark or signature.
Looks like something from a bead shop class and depending on the country, the "silver" pendant would be illegally marked.
The modern round brilliant started in 1919,this stone appears to have a flat culet which was still being cut into the 1930's.
Impossible to tell the type of colored stone from a photo,the OP's may be glass.
Rhodolite garnets can be the same light amethyst color.
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