CRB4218000 - LOVE ring, SM - Yellow gold, diamonds - Cartier 

https://www.cartier.com/en-us/jewelry/rings/love-ring-mini-model-paved-CRB4218000.html

Amazon.com: Miabella Solid 925 Sterling Silver Italian 5mm Diamond Cut Cuban Link Curb Chain Necklace for Women Men, Made in Italy (20 Inches): Clothing, Shoes & Jewelry 

https://www.amazon.com/MiaBella-Sterling-Italian-Diamond-Necklace/dp/B07KKFNSCJ/ref=sxin_25_sbv_search_btf?content-id=amzn1.sym.8aea4788-5372-43c5-bde7-3d239eb02a51%3Aamzn1.sym.8aea4788-5372-43c5-bde7-3d239eb02a51&crid=RXKMZX4GBXYP&cv_ct_cx=silver%2Bjewelry%2Bchain&keywords=silver%2Bjewelry%2Bchain&pd_rd_i=B07FPN34BG&pd_rd_r=b5db82be-0802-4f0b-a976-b5711a039dc5&pd_rd_w=SPuYm&pd_rd_wg=GXuKB&pf_rd_p=8aea4788-5372-43c5-bde7-3d239eb02a51&pf_rd_r=1GV9EP6NKM2K2ZW7C1WW&qid=1749107421&sbo=RZvfv%2F%2FHxDF%2BO5021pAnSA%3D%3D&sprefix=silver%2Bjewelry%2Bchain%2Caps%2C164&sr=1-1-5190daf0-67e3-427c-bea6-c72c1df98776&th=1