When evaluating Red Global Grapes (Red Globe), buyers should prioritize Brix levels (sugar content), which should ideally be between 16% and 20% for optimal sweetness. The berries must be firm, crunchy, and well-attached to the green, pliable stems. Look for a consistent deep red to ruby color and the presence of natural bloom (a waxy white coating), which indicates freshness and minimal handling. Avoid grapes with shriveled skins, brown stems, or leaking juice, as these are signs of senescence or poor cold chain management.