It looks like hammer and chisel engraved,but better photos would help.
I'm not sure where you got the information about jade,it is no more difficult than most stones.Some types are harder to get a good polish,but the...
Looks like a Pier One import from the 60/70's,stones,wood,metal top piece have poor carving and finish.
If it wasn't plated after engraving the names on the back,the triangle cuts at the top of the letters would deeper than any plating.
Circled areas too small to tell anything.
The platter does have 2 "maker's" marks under the M in March.The date format is normal for many in the USA,every one in the military used it and...
It probably has little value,it has been obsolete for at least 50+ years and only an optical machinery collector might be interested.
Your last photo is an AMERICAN OPTICAL COMPANY LENS CUTTING MACHINE MODEL NO.M541-D which is a lens edger that cuts the lens to the shape needed...
Do you have the link of the thread that it is a lens cutting machine? From the photo there is nothing on the machine to "cut" a lens.
Looks like it is palm wood.
It looks like it was hand chased and could have been a school project during the arts and craft period.
Too many people are confused with the Mexican onyx/travertine with a hardness of 4-5 on the mohs scale which is not real onxy.
@ KC Antique What happens is this. The emails are being sent to you, but they are simply not getting to you. Why ? There are several possible...
It may be modern or carved some time ago at Idar-Oberstein Germany which was the stone carving capital.
The pottery vase looks interesting,but I have never seen a Mexican piece with a Celtic zoomorphic " cross".
The bottom photo is blurry,but it looks like a carved snake and something else on the piece.
Looks a bit like an individual size shabu shabu pot.
The flat back faceted stone is probably from China and just about anyone could have made the ring,Is the "M" mark in the square on the inside left...
And there was a "face jug" on ARS .......... https://www.theguardian.com/tv-and-radio/2016/may/11/antiques-roadshow-expert-mistake-school-art-project
The rock looks like picture jasper.
Separate names with a comma.
