Featured ID help with green gemstone and age of diamond ring

This ring belonged to my grandmother so I believe it's an antique, but I'd like to have a better idea of its age. I'm puzzled about what type of gemstone this might be. It's not very evident from the photos, but the stone is opaque. It also has quite a few scratches and cracks so whatever type of stone it is, it's not very resistant to damage. The clear stones are diamonds and one of the diamonds is missing- see the lower right corner of the ring in the photos. Does anyone know if it would be very difficult for a jeweler to put a new diamond into the prong setting? I'm not sure if it's worth the expense as it doesn't stand out too much. The inside of the ring is stamped "K18". I thought it was a little odd that the K came before the 18 because I havent seen that before.

 

The metal and stone would need to be tested.The stone could be an emerald,but can't tell from the photo if it is natural or man made.

 

I'm with Holly, have it tested. Emerald is quite fragile, but it is a beautiful stone. Many emeralds are opaque.
The ring could be from the same period as your tourmaline one, but more classic in style.

 

Emeralds do seem to be a bit fragile: cracks, nicks, etc.

 

Emeralds are generally flawed, and easy to bang up. I'd check the ring for hallmarks first and then have it professionally tested. If that thing's a real emerald it's worth more than a few bucks.

 

From the photos, I also had the reaction that stone is emerald. However, since you say stone is opaque, my thought is that it is either chrysoprase, naturally occurring green chalcedony, or, because of the deep color, what I think is more likely, chalcedony that has been dyed to that color. Was grandmother old enough that she could have owned such a ring early in the 20th century? Hardststone cameos with a (dyed) green background layer were a fashion at the turn of the century & for a time after.

 

Easy to tell,just shine a light through the bottom of the stone and photo from the top.

 

If it's 18k gold and diamonds, I am betting that is an emerald.

 

Sorry for the late response everyone. I haven't been able to log on much this past week. I took a light to the gem and it is definitely not opaque. Here are some pictures that show the transparency of the gem. I tested the 18k gold and the diamonds so I know those are real. My grandmother was born in 1924 so I don't see her buying this ring until the 1940's, but it's hard to say with the possibilities of it being inherited or purchased as a pre-owned ring.

 

Looking good for emerald.

 

I found today this ring marked K18.
I tested it and result 18k white gold.
The white stones are diamonds.
The central stone is emerald.
I want to know the style and country of manufacture.
I believe it is antique.
Weight is 5.5 grams.
USA size is 4.75

 

Without a makers mark,no one can what country.

 

Can you tell me info about style of my ring.???

 

Cocktail ring ................. https://www.estatediamondjewelry.com/what-is-a-cocktail-ring/

 

You don’t say where you got these results.

You must consider that even though this was your grandmother’s that doesn’t mean it is antique. It may well be, but remember, she could have received it anytime in the far or recent past.

Did you take it to an estate jeweler, is that where you got your answers? And if gave you these answers couldn’t they give you an idea of when it was made?

 

I think OP's is Emerald too. Big for an emerald. Nice color but could be oiled. I would think it might be a good idea to get A GIA certified appraisal of it.

This page may help you understand emeralds and their value.


https://about.emeralds.com/emerald-characteristics/judging-emerald-quality/

 

Agree. Lovely stone.

 

Marie, this is a different ring and a different poster.

Welcome @endriabazi88 . Which country did you find the ring in? Does your country mark 18K gold as K18? If so, your country is likely to be the country of origin, because it is unusual to have the K first.

 

Well, that is usual for me to get mixed up