Mondial Pink Diamond Atelier will unveil the world’s most expensive Advent Calendar on December 1.
The unveiling will take place at its ground floor store in the Queen Victoria Building.
The calendar, worth in excess of A$4,000,000, has been handcrafted by master cabinet maker and Sydney resident Tim Garside.
It features natural Australian timbers and embellished with precious gemstones, gold and silver as well as hand-made, crystal chandeliers.
With secret doors and panels numbering 1 to 24, each day of December will reveal a new treasure to the public up until Christmas day.
The calendar will also draw attention to the historic QVB as it continues to celebrate its 120th birthday.
Mondial co-director Michael Neuman said the project has been under development for some time.
“This has been over 18 months in the making and we are so thrilled to finally see our vision come to life.
"For us, it really is about adding that spark of wonder and excitement back into Christmas and we are looking forward to seeing the faces of both adults and children light up as they look into our shop windows and see the incredible and totally unique display.
“While we understand that very few people can afford to purchase the Calendar, we do hope it draws attention to the magnificent coloured diamonds and gemstones that Australia produces as well as our fine timbers."
One half of the calendar consists of predominantly Australian Red Cedar, along with Australian walnut, and Forest Red Gum, features of Gold Leaf, natural gemstones and crystal.
The other side consists of predominantly Huon Pine, Birds Eye Maple, Silky Oak and Red Gum Burl along with features of Silver Leaf, natural gemstones and Crystal.