Sapphire, Emerald & Ruby Siren Gem Sell Locations in Sea of Thieves!
Siren Gems are treasure similar to Mermaid Gems, but with a swirling inner core, described to have darkness inside it. They can be obtained by defeating Sirens and Ocean Crawlers, or by finding them in Siren Shrines and Siren Treasuries.
Sapphire Siren Gem - 1,000 Gold
Emerald Siren Gem - 1,500 Gold
Ruby Siren Gem - 2,000 Gold
more info on siren gems: seaofthieves.fandom.com/wiki/...