Ready-made combination of DELFINA pendant lamps with leaf-shaped transparent shades with engraving https://www.lampatron.ru/cat/item/design-lamps-delfina/ 
The archive contains models for 23512 and 18 lamps (DELFINA D20 DELFINA D30 DELFINA D40 DELFINA D50 L18)

Version Corona 9 materials CoronaLegacyMtl
In versions of CoronaRender 6 and below CoronaLegacyMtl = CoronaMtl
CoronaLegacyMtl requires a version of Corona Renderer at least 1.5 since the cards are designed to use PBR (roughness-metallic)