according to Wilkinson 16 point stars, similar to this, are c. 1830 - earlier one were less deep and each radial arm was cut by means of two passes of the wheel - and if you look at the ends of the arms of those earlier stars they appear unequal in their length.
Unfortunately, as we know, the Victorians copied everything. How sharp is the cutting ? Is this lead glass do you think?
Often these relief diamonds suffer from knocks.
What are condiments - flavourings only? How about for small pickles.

If it had contained vinegar or similar for some time then you'd expect some sort of staining perhaps to the inside?
Not sure you're going to get a definitive answer Roy - one of those rather vague things about which the literature is a bit sparse in help.