The lead deal on this page is the Black Friday 25% off code at the top of this page, which takes 25% off black diamond jewelry in the Black Friday sale. That code is best if you are buying black diamond pieces that are in the sale and want the biggest percentage reduction on those items. For general purchases there is also a 25% off promo and a pair of 10% new customer promos to consider, plus a free stud on orders of $999 or more.
Low spend, under $999: use the 25% off code at the top of this page when the items you want are black diamond sale pieces. On a $500 order of eligible black diamond sale items, the 25% off code reduces the total to $375, so you save $125. If the items you want are not black diamond sale pieces but are among the selected items for the sitewide 25% code, use that 25% promo instead. First order or new customer only: if you are a first time buyer or otherwise eligible for the 10% new customer code, that gives 10% off but the saving is smaller than 25% on the same basket (on a $500 order the 10% code would save $50 and bring the total to $450).
Spend $999 or more: you qualify for the free stud deal that requires no code and applies on orders of $999 and up while stock lasts. That offer adds value but has no stated cash value, so for a straight basket price comparison use the 25% codes to calculate which leaves the lower total. For example, on a $1,200 order, the 25% off code at the top of this page reduces the order to $900, a saving of $300. The 10% new customer code on the same $1,200 order reduces it to $1,080, a saving of $120. If the free stud is valuable to you, factor that gift in alongside the numeric savings from a percent off code.
Buying sale black diamond pieces: use the Black Friday 25% off code at the top of this page because its terms explicitly cover black diamond sale products. Buying non sale items where a 25% sitewide promo applies: use the sitewide 25% promo code instead. First time buyer or new customer: use one of the 10% codes only if you cannot use a 25% code; the 10% codes state they cannot be combined with other offers, as does the 25% sitewide promo.
Our records show the biggest percentage code for Gemone Diamonds in the 12 months to November 2026 was 25% off and that 25% has been the typical code, with five percentage codes in that period. Our team made five checkout tests across five offers in the 12 months to November 2026, with four screenshot results kept as proof. Choose the single offer that leaves the lower total for your basket; where an offer’s terms explicitly forbid combining, do not combine it with other promo codes.