6cm by 4.5cm YES.
41cm total length of chain.
Each necklace has either gold or silver plated chain and jewellery findings.
The acrylic is hard wearing and durable, but to ensure the quality please avoid contact with direct heat and strong chemicals and just clean with a damp cloth. Always store and transport your jewellery in its box. Keep water, perfume and other sprays and lotions away from your jewellery, as moisture can discolour metal parts.