The Quartz comes from the famous Les Chétillons parcel in Le Mesnil sur Oger and has four atmospheres (59 psi) of pressure instead of the normal six (88 psi). While I would be hard pressed to tell by looking at or tasting this Champagne that it has lighter carbonation, it tastes very different from the Reserve due to the wonderful vineyard site. Since less yeast and sugar were added to the wine during bottling, it has less leesy flavor, and because there is less dissolved carbon dioxide in the wine the flavors of the grapes underneath shine more. Look for flavors of apple and brioche in this creamy, supple, mouthfilling Champagne. It is perfect for cocktail parties and as a starter for any event, and great to taste side by side with the Reserve. (Gary Westby, K&L Champagne buyer)