It means 18kt gold electroplated.
The little end nubs fit into the tiny holes in the ring then you expand or contract them depending on type of ring ( most are outside rings but some are inside rings)
It is the tangential stress ( normal to the radius) in a circular structure, such as a ring (hoop). For a example if you shrink fit a ring over a cylinder it will have hoop stress, tangential stress along the entire circumference.
Yes as long as both parties view it as an engagement ring.
You may mean Qwest fittings. (yes, with a 'w' not a 'u') This is a range of plastic plumbing compression fittings to fit many different pipes. They have an 'O' ring and a gripper inside a large nut to tighten onto the pipe. -Very hot item when they came out 20 or so years ago, now a little old fashioned compared to Sharkbite and similar fittings.
A dome valve might be described this way. Take a solid ring to use as a seat. Now cover the ring with a disk shaped like a contact lens or like a snow saucer. That curved surface will sit inside the ring to seal the valve, and to open it, a lever rotates the disk out of the way of the opening. Use the link to a picture of one. Clyde (in the UK) makes them, as do others, but this picture is animated! You'll get to see the dome valve in action, and that will probably make any further explanation unnecessary.
PLAT engraved on the inside of the ring indicates that the ring is made of Platinum.
Sterling silver
it means the metal is 9kart
It means that the Silver was mined in Nevada
18k hgf would stand for 18k heavy gold filled ( not solid gold )
"GE" stands for gold electroplate, meaning that it may not be a true gold ring. Have a licensed jeweler make that determination to be certain.
the bgg probably stands for the size of the ring
When these markings are stamped on a ring 18kt HGT ESPO, HGT stands for heavy gold electroplate meaning the ring is gold with a small amount of 18kt. ESPO is the jewelers stamp, in this case Joseph Esposito of Esposito Jewelry.
18KT Gold Electroplate. The rings base metal is electroplated with 18 kt gold.
18 carat gold
Love..
This usually means Palladium which is a white metal with similar properties to Platinum. I find that a lot of settings are made from this