Good sources for antique Cairngorm quartz?

[Blue-Seeker]

I'm looking for a reputable supplier of antique Victorian Cairngorm quartz, either loose stones or finished pieces, for a gift. Are there any collectors of this material out there who'd be willing to share the names of reputable ebay vendors, antiques dealers, etc., who may have pieces from this era? Just like any other gem, I'm wary that some sites are selling fakes, treated gems, antique reproductions, or engaging in other forms of chicanery. Becoming a member of PS has made me a much more careful shopper, that is for sure.

I am in the US, but am willing to work with European vendors.

Thanks for any help you can give me!