A Lora for a traditional Viking treasure necklace and turtle brooches. Viking women often wore these brooches and multi-stringed bead necklaces for appearance or to show off their wealth, or even just carry some valuable treasure with them to trade.

An example prompt:

masterpiece, best quality, absurdres, amazing quality, very aesthetic, 
sharp focus, subject focus, depth of field, vibrant colors, 1girl, 
arched back, cowboy shot, looking at viewer,
collarbone, head tilt, light smile, adjusting clothes, , 
, teasing, eyeliner, parted lips, beads, treasure_necklace,
blurry foreground, blurry background, viking, 
blue linen dress, norse trim, small , cheekbones, square neckline, white long sleeves undershirt, white long sleeves, blue spaghetti strap, 
outdoors, snow, forest, light particles, sunrise, grey fur shawl, 
auburn hair, blue eyes, braid, short hair, 
dramatic lighting, cinematic, perfect shading, concept art, 
<lora:Viking_Treasure_Necklace:0.8>

A very valuable tag for your negative prompt is:

pendant

I think the necklace tag connotes with pendant.

Try it out and have fun!