Need stone identification and Hallmark indetification please

[oldkeysandscissors]

I bought this at an estate sale. I can not identify the stone it is a huge, faceted, opaque purple stone, with no visible striations. Set in 925 silver (I did acid test this for certainty) I can not identify the stone or the makers mark, I am including several photos of the stone and setting and also a photo of weight and the makers mark. Any help would be appreciated. Thanks

 

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[crashbandicoot]

Can,t give you any info but it,s sure a pretty ring and a bit of an odd shape,I guess to fit the large stone!Nice!

 

[chadkeath]

Can,t give you any info but it,s sure a pretty ring and a bit of an odd shape,I guess to fit the large stone!Nice!

Maybe Sugilite stone. And mark could be the artist who made it.

 

[ANTIQUARIAN]

Welcome to Tnet from Toronto.

I have to question if this piece is actually Sterling Silver or not.
Now, I understand that you performed an acid on it, but the dis-coloring leads me to the above question.

"Sterling silver jewelry is always stamped with a marking to indicate the percentage of silver it contains. Usually, this appears as 925, . 925, or 92.5. In the U.S., anything less than 92.5% is not considered sterling silver. US law does NOT require precious metal to be marked with a quality stamp. Some European countries do require marking. People should question goods sold without markings that indicate precious-metal quality. There are various reasons why a genuine sterling silver item isn't marked. Perhaps the item is too small. Some narrow gemstone eternity rings for example have no place inside to mark it. Components that are sterling silver, such as beads, open or closed ring findings, or chain, have no room to be stamped. Sterling Silver wire is not stamped. The cost of getting a registered trademark costs over $1,000, and since BY LAW an item that is stamped 925 MUST have the manufacturer's registered trademark alongside the purity stamp, many small jewelers and Native American jewelers cannot afford this cost for a legal hallmark. Therefore, they will not stamp the item."

 

[blauer]

Without using my loupe I would say Sugilite as well.