A step-up ring increases the filter size of a lens, allowing you to attach larger filters. A step-down ring decreases the filter size, enabling you to use smaller filters on a larger lens.
A 14mm size ring is a US size 3.
The value of a 10kt gold-filled (gf) ring with a ruby may vary depending on factors such as the quality and size of the ruby, the condition of the ring, and current market trends. Generally, gold-filled jewelry is less valuable than solid gold jewelry. It's recommended to have the ring appraised by a professional to determine its specific value.
About Size: 7 US.
The ring size is 23.
19.5 ring size is
You can get your ring size at a jeweler, wait for a physica ring sizer in the mail or find your ring size online using a website such as httpP://FindMyRingSize.com
The rubies used to create fissure-filled stones are generally of very low quality. This kind of ruby is usually made more porous with an acid treatment. Then it is heated with other materials that make glass when the ruby gets hot enough. The glass fills in pits in the ruby. Therefore, parts of the stone are ruby, but parts are actually glass. Whether you consider this ruby "real" is up to you since parts are ruby, but depending on the size of the fissures that are filled, a significant part of the stone can be glass. The stones can be pretty, but glass does not have the same properties or hardness of a ruby.
You can go to a jeweler and they can size you there or you can download a ring size guide from online.
It appears you are speaking of gold filled rings, the method for making such is to fit a thin hollow tube of gold over a solid copper rod, then pull them through a draw plate. After several such reductions in size, the metal is cut to size and rings or bracelets or other objects are made from it.
RT" in the context of a ring typically stands for "Ring Size." Ring size is a measurement that indicates the circumference of the finger for which the ring is intended.
"K" doesn't stand for ring size, but the amount of gold in the ring.