This is a vintage ring, probably quite old, which is made of 9 carat gold and is set with a central green stone surrounded by 4 clear stones. The central stone could be an emerald or a tourmaline, and the clear stones must be some kind of natural, rough-cut crystals. They are not diamonds, we tested them. The green stone is 4mm square and the clear stones have a diameter of 2mm. The entire ring face has a diameter of 1.3cm. There is a worn hallmark on the inside (see photo), of which only the numbers 9 followed by 375 for 9 carat are still clearly legible. This method of indicating the carat both ways was discontinued in the early 20th century, so I reckon that this ring is older than the 1920s. The maker’s mark is G & T.J. The ring is quite a small size, size I or USA size 4 1/4. The ring weighs 2.43 grams and is in good overall condition with just a tiny wee chip to the edge of the green stone.