Handmade 925 Sterling Silver and Rainbow Moonstone Ring - Size 7

I bought this beautiful rainbow moonstone and silver ring from a local artisan, but it no longer fits. Does not have 925 stamp, but metal can be tested for purity. This is a note about the details from the artisan: THIS IS A BEAUTIFUL OVAL, BLUE FLASH, RAINBOW MOONSTONE RING WHICH I HANDCRAFTED USING 8 GAUGE, THICK, STERLING SILVER WIRE FOR THE BAND. I USED SCALLOPED BEZEL WIRE TO MAKE THE SETTING FOR THIS RING. I FORGED, SHAPED AND POLISHED THIS SILVER BY HAND AND SET THE STONE IN IT. THE STONE MEASURES 10MM X 14MM