What does 8 carat total weight mean here?

It is the combined weight of all the radiant-cut lab-created stones across the band, not one large stone. Each individual stone is much smaller than 8 carats.

Is a flush setting good for everyday wear?

Yes. The stones sit level with the metal, so they snag less on clothing and hair than a raised prong setting. The trade-off is that less of each stone is exposed to light.

Will sterling silver hold up as an engagement ring?

Sterling silver is softer than 14k or 18k gold and can tarnish, so it shows wear faster with daily use. It is a reasonable choice for a budget-conscious or occasional-wear ring.

Can this ring be resized?

A band fully set with stones is very hard to resize without disturbing the setting. Ask about sizing before buying, and expect limited adjustment afterward.

How should I care for lab-created stones in silver?

Clean with mild soap and warm water, dry fully, and store separately to avoid scratches. Avoid chlorine and harsh chemicals, which dull silver and can affect the setting.