It means the answer to a qUestion

In a business environment the acronym QCD stands for Quality, Cost and Delivery.

This is a very well respected system for measuring performance within a business area or department. The system first suggests the adoption of measures for the Effectiveness of the business area or activity, measured in terms of Quality performance and Delivery performance, each normally represented by a percentage result.

The cost element reflects the Efficiency measures relating to the activity. Each of these Cost elements relate to a different area of Resources that need to maintained in order to continue the business activity. Generally here we cover the ground relating to People, Materials, Workplace (overhead) and Equipment (plant, machinery etc). These areas of performance are normally measured in terms of the volume of output achieved per unit of resource (quantity or spend).

I am sorry but I am no expert on QCD but it is quantum physics in relation to the strong force.

QCD is a makers mark. It means the piece was made by a company called Quality Color Design, Inc. They manufacture 14k gold, 18k gold, silver and platinum jewelry, some with diamonds and/or precious or semi precious stones, for retail jewelers.

Z. Frei has written:

'Surface energy from order parameter profile at the QCD phase transition' -- subject(s): Surface energy, Quantum chromodynamics

'Chiral interface at the finite temperature transition point of QCD' -- subject(s): Chirality, Atomic theory