This is an early 20th century Art Nouveau 1 & 5/8 by 7/8 inches pendant of silver (0.800--the bale is sterling & new) and plique-a-jour enamel (light of day). It has unusual colors and no marks. Whenever I see fighting greens/yellows, I think "French", but this could have been made anywhere. It has 2 tiny seed pearls and two brilliant blue stones that are real stones. Possibly iolite, long called the "water sapphire". Check them under a strong loupe--they're gorgeous. It is in excellent condition--no signs of age or stress on the enamel.