Each SARDA™ Monday show debuts brand-new handcrafted pieces in .925 sterling silver — and the June 15 lineup brings some of the most distinctive gemstones we've featured yet. From a rare Russian mineral found in very few jewelry collections worldwide to one of Africa's most prized precious gems, here's your guide to every stone debuting this week.

Eudialyte — Russia's Rare Crimson Stone

Eudialyte is one of the rarest minerals to appear in finished jewelry. A cyclosilicate mineral found primarily in the alkaline igneous formations of Russia's Kola Peninsula, it ranges in color from deep crimson and raspberry to soft rose — caused by manganese and rare earth elements embedded in its crystal structure. No two stones look alike; each has an organic, mottled pattern of deep red, black, and cream that makes every piece unmistakably unique.

The name comes from the Greek for "easily dissolved" — a property that made it notable to early mineralogists. Eudialyte ranks 5–5.5 on the Mohs hardness scale. Clean with a soft damp cloth only; avoid ultrasonic cleaners and harsh chemicals, and store separately from harder stones to prevent surface damage. This week, eudialyte anchors the One That See's Me collection in rings, a bracelet, and a pendant — set in oval cabochon (20x15mm, 11.48 ctw) and long cushion cabochon (20x10mm, 9.03 ctw) cuts. Learn more from the International Gem Society's guide to eudialyte.

Strawberry Quartz — Tanzania's Rosy Sparkle

A warm rose-pink member of the quartz family, strawberry quartz is named straightforwardly — its color genuinely resembles a ripe strawberry in warm light. The stones in this week's debut come from Tanzania, cut into cushion square faceted forms (10mm, 3.61 ctw) that draw out the gentle shimmer of the stone's natural inclusions. It's an easy-to-wear stone that pairs naturally with sterling silver and sits warmly alongside the deeper reds of eudialyte.

At Mohs 7, strawberry quartz handles everyday wear well. Clean with mild soap and warm water, rinse thoroughly, and store away from harder stones. This week it appears in the One That See's Me collection alongside eudialyte in rings, a bracelet, and a pendant. Further reading at the International Gem Society's quartz guide.

Tanzanian Ruby — Africa's Prized Red

Ruby has been described as the "king of precious stones" since antiquity — found in ancient Sanskrit texts, traded along the Silk Road, and worn by royalty across cultures for thousands of years. The rubies in this week's debut come from Tanzania, one of Africa's key ruby-producing regions, and are presented in a round checkerboard cabochon cut (9mm, 3.87 ctw) that emphasizes their natural depth of color.

Tanzania's rubies are known for their deep, saturated red, driven by chromium content in the corundum crystal. These stones are untreated — their color is entirely natural with no heat or other enhancement. Ruby ranks 9 on the Mohs scale, making it one of the hardest and most durable gemstones available. Clean with a soft brush, mild soap, and warm water. This week, Tanzanian ruby appears in the One That See's Me collection as a ring. Read the full story at GIA's ruby guide.

Angelite — Peru's Quiet Sky Blue

Angelite is a trade name for a pale blue variety of anhydrite — a calcium sulfate mineral found in Peru, where it forms from ancient seabeds that have slowly compressed and recrystallized over millions of years. The result is a soft, powdery sky-blue stone with a gentle matte-to-waxy surface. Its blue is quieter than turquoise, cooler than amazonite, and more muted than blue topaz — a stone that wears without demanding attention.

In this week's Seen UR Faithfulness debut, angelite (oval cabochon, 14x10mm, up to 5.95 ctw) is paired with Serenity Blue Chalcedony accents from India (round checkerboard cabochon, 4mm, 0.3 ctw) for a tonal, layered blue pairing across rings and bracelets. Angelite rates just 3.5 on the Mohs scale — the softest stone this week. Keep it completely dry; moisture and water can alter its surface over time. Store separately in a soft pouch. Learn more at the International Gem Society.

Olive Quartz — Brazil's Earthy Green-Gold

Olive quartz begins as natural Brazilian quartz and is treated through irradiation — a controlled, industry-standard process — to achieve its distinctive olive-green, warm gold-brown hue. The color sits between pressed olive oil and late-summer grass, and the round birdnest cut used in this week's debut adds a carved, textured surface that gives each stone an organic, sculptural character.

Brazil is one of the world's leading quartz producers, and Brazilian quartz is well regarded for its clarity and scale. At Mohs 7, olive quartz is practical for rings, bracelets, and pendants alike. Avoid prolonged sun exposure, which can affect irradiated stones over time. Clean with mild soap and warm water. This week, olive quartz features across the Give Him UR Fears collection in a ring, bracelet, and pendant (up to 7.4 ctw). More context from the International Gem Society.

Black Diamond — The Dramatic Stone from Central Africa

Black diamonds are natural diamonds whose opaque appearance comes from dense inclusions of graphite, pyrite, and other minerals throughout the crystal structure. Unlike transparent white diamonds — which refract and scatter light — black diamonds absorb it, producing a sleek, matte-to-metallic surface that reads more like polished onyx in visual character. The black diamonds debuting this week come from the Central African Republic and are cut in hexagonal and round rose-cut cabochon forms. The rose cut, an antique style dating to the 16th century, features a flat base and a gently domed faceted top — all quiet depth, no flash.

As diamonds, they rank 10 on the Mohs scale — the hardest natural material available — and are fully durable for everyday wear. Clean with a soft brush, mild dish soap, and warm water. This week, black diamond appears in the Stronger in U collection in bracelets and rings (0.54–0.64 ctw). Full background at GIA's diamond guide.

Caring for This Week's Stones

This week's lineup spans nearly the full range of the Mohs scale — from the hardest natural material to one of the softest. Knowing which pieces need extra attention keeps your collection looking its best.

• Black Diamond (Mohs 10) and Ruby (Mohs 9): Very durable. Soft brush, mild soap, and warm water. Safe for regular daily wear.
• Strawberry Quartz, Serenity Blue Chalcedony, and Olive Quartz (Mohs 7): Good everyday durability. Warm soapy water; store away from harder stones to avoid light surface scratches.
• Eudialyte (Mohs 5–5.5): Moderately soft. Damp cloth only — no ultrasonic cleaners or harsh chemicals. Store away from harder pieces.
• Angelite (Mohs 3.5): The most delicate stone this week. Keep completely dry; moisture can damage the surface. Store alone in a soft pouch.

For all sterling silver SARDA™ pieces, our Jewelry Cleaning Kit makes it easy to keep silver polished at home. Read the complete SARDA jewelry care guide for more.

Every debut piece from the June 15 show will be available online shortly after the Monday show. Browse all new arrivals at SARDA™ →