SGF Solid 10K White Gold Trillion Cut Blue Aquamarine Prong Set Stud Earrings

SGF solid 10K white gold stud earrings set with trillion cut aquamarine, marked 10K with the SGF maker's mark. Each stone is a triangle with gently convex sides and softly rounded corners, held in a three prong basket where the prongs sit directly on the three points so nothing interrupts the sides of the triangle. The baskets are open underneath and pierced along the walls, which lets light enter from below and from the sides rather than only through the table, and the stones carry a clear pale blue that deepens toward the corners where the pavilion runs deepest.

A trillion is cut to spread rather than to go deep. The shape puts nearly all of a stone's weight into surface area, so a trillion covers considerably more of the earlobe than a round of the same carat weight, which is why the cut is favored for studs. The triangular outline also means the stone reads as a shape at a glance rather than as a generic point of light, and three corners catch raking light at angles a round never produces.

Posts with new silicone backs included.

Verifications:
Solid 10K gold has been verified using an Auracle Gold Analyzer.
Aquamarine has been verified using a Presidium Gem Tester II.

Details:
Maker's Mark: SGF
Metal: Solid 10K White Gold
Hallmarks: 10K, SGF
Stones: Aquamarine
Stone Cut: Trillion
Setting: Three Prong Basket
Earring Style: Stud
Closure: Post with silicone backs, new
Condition: Excellent estate condition

Fun Facts:
Aquamarine and emerald are the same mineral. Both are beryl, and the entire difference between a stone worth a fortune and a stone worth a fraction of it comes down to which trace element wandered into the crystal, iron for blue or chromium for green. Beryl also grows larger and cleaner than almost any other gem species, which is why the largest cut aquamarine in the world, the Dom Pedro, stands roughly fourteen inches tall and lives at the Smithsonian rather than in anyone's jewelry box.
The name is literally seawater, from the Latin aqua marina, and the association was not poetic but practical. Roman sailors carried aquamarine amulets as protection on open water and believed the stone calmed waves and guaranteed safe passage home, a tradition that outlasted Rome by well over a thousand years. It remains one of the few gemstones whose name describes its color and its folklore at the same time.