Well the marks you describe indicate that it's made of 9ct gold, and the anchor tells you that it was hallmarked in birmingham.
The Z is the date letter. Date letters work on a 20 year cycle so there is more than one z in the date listings. It will depend on the font and the shape of the shield that surrounds it, but if you're sure it's a victorian fob, then the nearest date will be 1899.
The next Z was struck in 1924.
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Bloodstone & Antique Jewelry by: Anonymous
Hi Geoff just thought I'd pitch in regarding the bloodstone you mention. In the list of gemstones, bloodstone has quite an interesting history; it being a popular choice for FOBS, SEALS & INTAGLIOS in the Victorian era and not only for it's carving qualities.
The red spots on some stones have even been utilized on some antique cameos to indicate drops of blood on carved figures such as Christ.
Medieval Christians often used bloodstone to carve scenes of the crucifixion and martyrs, for which reason it was also dubbed the martyr's stone. According to legend about the origin of bloodstone, it was first formed when drops of Christ's blood fell and stained some jasper at the foot of the cross. A beautiful example of carved bloodstone with the seal, an intaglio of the German Emperor Rudolf II can be seen at the Louvre in Paris.
