Tandon Gems

Anniversary gemstones by year with bead strand sizes and shapes

Tara Tandon, Tandon GemsPublished October 9, 2024· Reviewed September 6, 2026· 4 min read

This article is a reference guide. Some older product details and imagery have been omitted pending verification. Confirm the current strand, price and quantity with Anish before ordering.

Short answer

Here's the go-to map: 3 Pearl, 4 Blue topaz (or aquamarine), 5 Sapphire, 6 Amethyst, 7 Onyx, 8 Tourmaline, 9 Lapis, 10 Diamond accents, 11 Turquoise, 12 Jade or alexandrite, 13 Citrine, 14 Opal, 15 Ruby, 20 Emerald, 25 Silver-themed, 30 Pearl. For bracelets use 4 to 8 mm rondelles or rounds; for earrings pick pears or hearts; for necklaces use 3 to 6 mm strands.

In short

  • Use 6 mm about 25 beads for a 7.5 in bracelet; 8 mm about 19; 4 mm about 38.
  • One 15 to 16 in strand of 6 mm rondelles makes most bracelets or chokers.
  • Pear or heart drops read "gift" on earrings at 6x9 to 7x10 mm.
  • Soft stones (pearl, opal) shine in necklaces and earrings, not daily bracelets.
  • Tourmaline, sapphire and lapis take daily bracelet wear; opal and tanzanite do not.

Which gemstones match each anniversary year, and what bead sizes work?

We map the common list to bead strands you can string with confidence. Sources vary on a few years, so we note options where lists differ. Link into our guides for material notes and shape picks as you plan gifts.

  • 3 Pearl: classic rounds 8 to 10 mm for bracelets or strands of 4 to 6 mm rondelles for necklaces. Fireball singles make pendants. Pearl guide.
  • 4 Blue topaz or aquamarine: 4 mm topaz rondelles for bracelets, pears for earrings; or 4 to 6 mm aquamarine rondelles and 6x9 mm pears. Aquamarine.
  • 5 Sapphire: micro-faceted 2 to 4 mm rondelles for bracelets and chains, 6x9 mm pear briolettes or 8 mm hearts for earrings. Sapphire.
  • 6 Amethyst: 3 to 4 mm faceted rondelles for stacks, pears or hearts for drops. Amethyst.
  • 7 Onyx: 6 or 8 mm rounds for bracelets; bar or coin shapes for men's gifts. If you prefer blue, lapis fills this slot well for beadwork.
  • 8 Tourmaline: 2 to 4 mm multi-color rondelles for necklaces and bracelets; single crystal sticks or slices as focals.
  • 9 Lapis lazuli: 5 mm faceted rondelles or 8 mm rounds for bracelets; geometric cuts for pendants. Lapis.
  • 10 Diamond accents: pair a diamond charm with 2 to 3 mm sapphire or 4 mm aquamarine beads for a full strand gift.
  • 11 Turquoise: 3 to 4 mm smooth rondelles or heishi for bracelets, nuggets and ovals for pendants and necklaces. Turquoise.
  • 12 Jade or alexandrite: many lists say jade, some say alexandrite. For bead gifts, go green with 3 mm emerald or peridot rondelles, or 6x9 mm emerald pears. Emerald, Peridot.
  • 13 Citrine: 3 to 4 mm shaded citrine rondelles for bracelets and chains; pear briolettes for earrings. Citrine.
  • 14 Opal: 3 to 5 mm smooth Welo opal rondelles for necklaces; pear drops for earrings. Avoid daily bracelet wear. Opal.
  • 15 Ruby: 2 to 2.5 mm shaded rondelles as spacers or delicate bracelets, pear drops for earrings. Ruby.
  • 20 Emerald: 2.5 to 3 mm shaded rondelles for necklaces and bracelets; 6x9 to 7x10 mm pears or 4x5 mm hearts for earrings.
  • 25 Silver-themed: there is no single official gem, so pair sterling with cool tones like aquamarine, opal or lapis in 3 to 6 mm strand sizes.
  • 30 Pearl: layer 4 to 6 mm necklaces or give a bracelet in 8 to 10 mm rounds; fireball pendants read celebratory. Pear shape.

How many 6 mm beads do you need for a gift bracelet or necklace?

Plan counts before you cut. On a 7.5 inch bracelet with a clasp, the beaded run is about 6 inches, so 6 mm uses about 25 beads. A 7 inch bracelet uses about 23 beads at 6 mm. An 18 inch necklace takes about 70 beads at 6 mm, and a 16 inch choker about 61.

  • 4 mm: bracelet about 38, 18 in necklace about 104
  • 6 mm: bracelet about 25, 18 in necklace about 70
  • 8 mm: bracelet about 19, 18 in necklace about 52
  • 10 mm: bracelet about 15, 18 in necklace about 41

What bead sizes make bracelets that actually hold up?

Daily-wear bracelets want tougher stones. We see sapphire, tourmaline, amethyst, lapis and turquoise do well in 4 to 8 mm, with 6 mm the sweet spot. For softer or brittle gems like pearl, opal and tanzanite, keep them for necklaces and earrings or use them as spaced accents away from the wrist impact zone.

Knotting between beads adds about 1 mm per knot to length, so size down or shorten your count if you plan to knot. Metal spacers near the clasp reduce rub on delicate beads.

Which bead shapes look best for anniversary gifts?

Bracelets read cleanest in rondelles at 4 to 6 mm, or 8 mm for a bolder stack. Necklaces string smoothly in ovals, rondelles or heishi for columns of color.

Earrings love movement and light, so use pears at 6x9 to 7x10 mm, or hearts around 4 to 8 mm. Rectangles create modern bar drops and simple focal pendants.

How long are strands, and will one cover a bracelet or choker?

Our Jaipur-cut strands usually run 13 to 16 inches. One strand covers a bracelet or a 16 inch choker, and two strands build a longer necklace. A 15 to 16 inch strand of 6 mm rondelles holds about 65 to 70 beads, and 8 mm rondelles about 48 to 52.

For a princess 18 inch necklace, plan about 16.5 inches of beads once you allow for clasp space. Two shorter strands can be combined for a matinee length.

How should we string softer anniversary stones?

We switch to necklaces and earrings for pearl and opal gifts. If a bracelet is a must, cluster just a few soft beads between harder spacers like sapphire or tourmaline and crimp covers at contact points. Tara here: we also step up wire size one notch and test the bracelet drape before final trimming.

Common questions

Can one 16 inch strand make two bracelets?

Yes. Most 15 to 16 inch strands of 4 to 8 mm beads will cover two clasped bracelets because each bracelet uses about 5.5 to 6 inches of beads on a 7 to 7.5 inch fit.

What mm size feels right for a men's bracelet gift?

Lapis or turquoise in 8 mm reads classic and substantial. For slimmer stacks, use 6 mm. Both sizes are supported by our bead math counts for standard wrist lengths.

Are pears or hearts better for anniversary earrings?

Pears at about 6x9 to 7x10 mm give classic movement and fit most ears. Hearts around 4 to 8 mm read romantic and sit closer to the face. Pick to match their style.

How many 4 mm beads do I need for an 18 inch necklace?

About 104 beads of 4 mm will string an 18 inch necklace, allowing for clasp space as noted in the bead math.

What do I pick for the 12th if I can't source jade or alexandrite beads?

Go green with 3 mm emerald or peridot rondelles, or use 6x9 mm emerald pears for earrings. They honor the color theme and string reliably.

Sources and checks

  1. Anniversary Gifts By Year - International Gem Society
  2. Wedding Anniversary Gemstone List, Years 11 through 20
  3. Milestone Anniversary Jewelry and Gemstone Gift Buying Guide (Traditional and Modern Gifts) - International Gem Society
  4. Bead and Necklace Size Charts - International Gem Society

Catalog details are reference information. Ask Anish to confirm the current strand, price and availability.

Want a strand like the ones in this post?

Message Anish with the stone, shape and size you have in mind. Photos of actual strands on request.

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