(//∇//)…I was just about to run out of battery, but I'll plug it in and explain! (u_u) I don't think even experts know this, but the engraving is (@_@) WGN... it's a very old vintage ring. In the old Showa era, the most expensive precious metal was |(￣3￣)|, unlike today. Platinum was the highest price at the time, 8,000 yen per gram. o(^▽^)o The cost of living was different back then, so it was incredibly expensive. Now, it's about 12,000 yen per gram, the highest it's ever been, but usually it's around 4,000 yen. At the time, the price of gold was about 1,000 to 2,000 yen per gram, about half the price of platinum. (u_u) So... everyone wanted platinum, but it was too expensive to buy back then. Now, platinum is cheaper than gold. k18WG (18-karat white gold) is generally made by mixing 75% gold with palladium (a platinum group metal, now much cheaper than gold) alloyed with rhodium (formerly a platinum group metal) plating, which rarely causes allergic reactions. ♪(´ε｀ ) In the past, platinum group metals were much more expensive than gold, so nickel was mixed with gold to make k18 and k14 white gold all over the world. At the time, even top brands used nickel as an alloy in their k18 and k14 white gold... (=^▽^)σ Nickel wasn't well-understood back then, but it caused metal allergies. Because of this, with long-term use and sweat, the white gold would discolor in places, turning gold instead of white. Because using expensive platinum group metals as an alloy would reduce profits, generally, white gold was an alloy of gold, nickel, and a small amount of silver or copper. But, d(￣ ￣) like this ring, there were hardly any accessories that honestly stamped "WG" and "N" (nickel) as the alloy. ( ´ ▽ ` ) However, the purity of the alloy can only be determined by X-ray inspection. |(￣3￣)| Vintage (a rare item of value) is extremely rare and hardly available. The gemstone is d(^_^o) like a light purple amethyst, but W(`0`)W what is it? @(・●・)@ Because it's light purple, it sometimes looks like alexandrite's blue color depending on the light. Something like this (● ˃̶͈̀ロ˂̶͈́)੭... I can't take good pictures at the end.