Diamond Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

TINKRSTUFF is the best-performing diamond brand in July 2026, moving 40,000 units across 1 ASIN for 32.0% of Top 10 volume. Blue Diamond Almonds follows with 36,000 units (28.8%), ahead of Diamond Crystal on 19,000 units (15.2%).

With 6 brands splitting the Top 10 and 76.0% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $6.99 to $10.98, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B0143UXN4W booked 10K units at $10.92, with ▲ 66.7% MoM change. On the growth side, B000WFIYQU leads positive momentum with ▲ 100.0% MoM growth on 2K units, with B0018CIPGA close behind at ▲ 100.0% MoM on 2K units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.